Information:  - Zalmoxis  is a divinity of the Getae and Dacians (a people of the lower Danube), mentioned by Herodotus in his "Histories" IV, 9396.  - The Danube (, known by various names in other languages) is Europe's second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe.  - See Kogaionon ( genus ) for the mammal from the Upper Cretaceous . Kogaionon was the holy mountain of the Geto - Dacians , the place where Zalmoxis stayed in an underground cave for three years . After his disappearance into Kogaionon , he was considered dead by the Getae but after three years he resurrected and showed himself to the people , who became convinced by his holy preaching when he emerged from Kogaionon . Strabo claims that a river with the same name flowed in the vicinity . One modern translation of Kogaionon is `` sacred mountain '' , which would be connected to a probable Dacian word kaga meaning `` sacred '' , attested in two early 2nd century inscriptions from Tomis . Kogaionon 's location is still under debate , but thought to be either in the area around the Dacian capital Sarmizegetusa Regia ( there is a 2291m summit there called Gugu and there are speculations that it could be the holy mountain ; it may also have been Dealul Grditei where the ruins of the sanctuaries of Sarmizegetusa are located ) or even the Ceahlu mountain , because every year on 6/7 August the shadow of the mountain forms a pyramid which is thought to have been made by the Dacians .  - The Getae or or Gets (singular ) are several Thracian tribes that once inhabited the regions to either side of the Lower Danube, in what is today northern Bulgaria and southern Romania. Both the singular form "Get" and plural "Getae" may be derived from a Greek exonym: the area was the hinterland of Greek colonies on the Black Sea coast, bringing the Getae into contact with the Ancient Greeks from an early date. Several scholars, especially in the Romanian historiography, posit the identity between the Getae and their westward neighbours, the Dacians.  - Herodotus ("Hródotos") was a Greek historian who was born in Halicarnassus in the Persian Empire (modern-day Bodrum, Turkey) and lived in the fifth century BC (484 425 BC), a contemporary of Socrates. He is widely referred to as "The Father of History" (first conferred by Cicero); he was the first historian known to have broken from Homeric tradition to treat historical subjects as a method of investigationspecifically, by collecting his materials systematically and critically, and then arranging them into a historiographic narrative. "The Histories" is the only work which he is known to have produced, a record of his "inquiry" (or "historía") on the origins of the Greco-Persian Wars, including a wealth of geographical and ethnographical information. Some of his stories were fanciful and others inaccurate; yet he states that he was reporting only what was told to him and was often correct in his information. Despite Herodotus' historical significance, little is known of his personal history.    After reading the paragraphs above, choose the best answer for the entity that related to 'kogaionon' with the relationship of 'country'.  Choices: - bulgaria  - european union  - persian empire  - romania
romania