Teacher:In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).
Teacher: Now, understand the problem? Solve this instance: Context: Elephas is one of two surviving genera in the family of elephants, Elephantidae, with one surviving species, the Asian elephant "Elephas maximus"., Mexico (, modern Nahuatl ), officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Covering almost two million square kilometers (over 760,000 sq mi), Mexico is the sixth largest country in the Americas by total area and the 13th largest independent nation in the world. With an estimated population of over 120 million, it is the eleventh most populous country and the most populous Spanish-speaking country in the world while being the second most populous country in Latin America. Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana and León., Sir Charles Lyell, 1st Baronet, (14 November 1797  22 February 1875) was a British lawyer and the foremost geologist of his day. He is best known as the author of "Principles of Geology", which popularized James Hutton's concepts of uniformitarianismthe idea that the Earth was shaped by the same processes still in operation today. "Principles of Geology" also challenged theories popularized by Georges Cuvier, which were the most accepted and circulated ideas about geology in England at the time., The Pliocene (also Pleiocene) Epoch is the epoch in the geologic timescale that extends from 5.333 million to 2.58 million years BP. It is the second and youngest epoch of the Neogene Period in the Cenozoic Era. The Pliocene follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to the 2009 revision of the geologic time scale, which placed the four most recent major glaciations entirely within the Pleistocene, the Pliocene also included the Gelasian stage, which lasted from 2.588 to 1.806 million years ago, and is now included in the Pleistocene., Stegomastodon ('roof breast tooth') is an extinct genus of gomphothere, a family of proboscideans. It is not to be confused with the genus "Mammut" from a different proboscidean family, whose members are commonly called "mastodons", nor with the genus "Stegodon", from yet another proboscidean subfamily, whose members are commonly called "stegodonts"., Primelephas is a genus of Elephantinae that existed during the Miocene and Pliocene epochs . The name of the genus suggests ' first elephant ' . These primitive elephantids are hypothesised to be the common ancestor of Mammuthus , the mammoths , and the closely allied genera Elephas and Loxodonta , the African and Eurasian elephants , diverging some four to six million years ago . Unusual for an elephant , it had four tusks . The type species , Primelephas gomphotheroides , was described by Vincent Maglio in 1970 , the specific epithet indicating the fossil specimens were gomphothere - like . Primelephas korotorensis is the only other species to be assigned to the genus ., The Miocene is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words (', less) and (', new) and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene Epoch and is followed by the Pliocene Epoch., Cuvieronius is an extinct New World genus of gomphothere and is named after the French naturalist Georges Cuvier. Alive, species stood, on average, about 2.3 m (7.5 ft) tall at the shoulder, weighed about 3.5 tonnes (3.9 tons) and would have superficially resembled modern elephants with spiral-shaped tusks., Gomphotheres are any members of the diverse, extinct taxonomic family Gomphotheriidae. Gomphotheres were superficially elephant-like proboscideans. They were widespread in North America during the Miocene and Pliocene epochs, 121.6 million years ago. Some lived in parts of Eurasia, Beringia, and following the Great American Interchange, South America. Beginning about 5 million years ago, they were gradually replaced by modern elephants, apart from the last two South American genera, of which "Cuvieronius" did not become extinct until possibly as recently as 9,100 BP, and "Stegomastodon" fossils have been dated to as recently as 6,060 BP in the Valle del Magdalena, Colombia. These gomphotheres also survived in Mexico and Central America until the end of the Pleistocene., Elephantidae is a family of large, herbivorous mammals collectively called elephants and mammoths. These are terrestrial large mammals with a snout modified into a trunk and teeth modified into tusks. Most genera and species in the family are extinct. Only two genera, "Loxodonta" (African elephants) and "Elephas" (Asiatic elephants), are living., Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a "backbone" or "spine"), derived from the notochord. This includes all animals apart from the subphylum Vertebrata. Familiar examples of invertebrates include insects; crabs, lobsters and their kin; snails, clams, octopuses and their kin; starfish, sea-urchins and their kin; and worms., Beringia is defined today as the land and maritime area bounded on the west by the Lena River in Russia; on the east by the Mackenzie River in Canada; on the north by 72 degrees north latitude in the Chukchi Sea; and on the south by the tip of the Kamchatka Peninsula. It includes the Chukchi Sea, the Bering Sea, the Bering Strait, the Chukchi and Kamchatka Peninsulas in Russia as well as Alaska in the United States., Elephants are large mammals of the family Elephantidae and the order Proboscidea. Two species are traditionally recognised, the African elephant ("Loxodonta africana") and the Asian elephant ("Elephas maximus"), although some evidence suggests that African bush elephants and African forest elephants are separate species ("L. africana" and "L. cyclotis" respectively). Elephants are scattered throughout sub-Saharan Africa, South Asia, and Southeast Asia. Elephantidae is the only surviving family of the order Proboscidea; other, now extinct, members of the order include deinotheres, gomphotheres, mammoths, and mastodons. Male African elephants are the largest extant terrestrial animals and can reach a height of and weigh . All elephants have several distinctive features, the most notable of which is a long trunk or proboscis, used for many purposes, particularly breathing, lifting water, and grasping objects. Their incisors grow into tusks, which can serve as weapons and as tools for moving objects and digging. Elephants' large ear flaps help to control their body temperature. Their pillar-like legs can carry their great weight. African elephants have larger ears and concave backs while Asian elephants have smaller ears and convex or level backs., The Asian or Asiatic elephant ("Elephas maximus") is the only living species of the genus "Elephas" and is distributed in Southeast Asia from India in the west to Borneo in the east. Three subspecies are recognised"E. m. maximus" from Sri Lanka, the "E. m. indicus" from mainland Asia, and "E. m. sumatranus" from the island of Sumatra. Asian elephants are the largest living land animals in Asia., The Neogene is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago (Mya) to the beginning of the present Quaternary Period Mya. The Neogene is sub-divided into two epochs, the earlier Miocene and the later Pliocene. Some geologists assert that the Neogene cannot be clearly delineated from the modern geological period, the Quaternary., Subject: primelephas, Relation: parent_taxon, Options: (A) area (B) asian elephant (C) elephantidae (D) elephas (E) gomphothere (F) idea (G) insects (H) mya (I) neogene (J) starfish (K) vertebrata
Student:
elephantidae