Question: Information:  - The Indianapolis 500 is an automobile race held annually at Indianapolis Motor Speedway in Speedway, Indiana, an enclave suburb of Indianapolis, Indiana. The event is held over Memorial Day (originally Decoration Day) weekend, which is typically the last weekend in May. It is contested as part of the Verizon IndyCar Series, the top level of American Championship Car racing, an open-wheel formula colloquially known as "Indy Car Racing". The name of the race is often shortened to Indy 500.  - Pennsylvania (Pennsylvania German: "Pennsylvaani"), officially the Commonwealth of Pennsylvania, is a state located in the northeastern and Mid-Atlantic regions of the United States. The Appalachian Mountains run through its middle. The commonwealth borders Delaware to the southeast, Maryland to the south, West Virginia to the southwest, Ohio to the west, Lake Erie and the Canadian province of Ontario to the northwest, New York to the north, and New Jersey to the east.  - Arizona (O'odham: "Al onak" [ai onak]) is a state in the southwestern region of the United States. It is also part of the Western United States and the Mountain West states. It is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, and one point in common with the southwestern corner of Colorado. Arizona's border with Mexico is 389 miles (626 km) long, on the northern border of the Mexican states of Sonora and Baja California.  - A suburb is a residential area or a mixed use area, either existing as part of a city or urban area or as a separate residential community within commuting distance of a city. In most English-speaking regions, suburban areas are defined in contrast to central or inner city areas, but in Australian English and South African English, "suburb" has become largely synonymous with what is called a "neighborhood" in other countries and the term extends to inner city areas. In some areas, such as Australia, China, New Zealand, the United Kingdom, and a few U.S. states, new suburbs are routinely annexed by adjacent cities. In others, such as Arabia, Canada, France, and much of the United States, many suburbs remain separate municipalities or are governed as part of a larger local government area such as a county.  - The 1955 AAA Championship Car season consisted of 11 races , beginning in Speedway , Indiana on May 30 and concluding in Phoenix , Arizona on November 6 . There was also one non-championship event in Mechanicsburg , Pennsylvania . The AAA National Champion and Indianapolis 500 winner was Bob Sweikert . Manny Ayulo was killed at Indianapolis while practicing for the 1955 Indianapolis 500 , and Bill Vukovich , the two - time defending winner , was killed in the race itself . Jack McGrath , the two - time champion ( 1952 , 1953 ) , was killed in the final race at Phoenix on lap 85 . This was the last year of the AAA National Championship ; USAC sanctioned the series starting the next year .  - Nevada (Spanish for "snowy"; see pronunciations) is a state in the Western, Mountain West, and Southwestern regions of the United States of America. Nevada is the 7th most extensive, the 34th most populous, and the 9th least densely populated of the 50 United States. Nearly three-quarters of Nevada's people live in Clark County, which contains the Las VegasParadise metropolitan area where three of the state's four largest incorporated cities are located. Nevada's capital is Carson City. Nevada is officially known as the "Silver State" because of the importance of silver to its history and economy. It is also known as the "Battle Born State", because it achieved statehood during the Civil War (the words "Battle Born" also appear on the state flag); as the "Sage-brush State", for the native plant of the same name; and as the "Sage-hen State". Nevada borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast and Utah to the east.  - The Appalachian Mountains, often called the Appalachians, are a system of mountains in eastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. It once reached elevations similar to those of the Alps and the Rocky Mountains before naturally occurring erosion. The Appalachian chain is a barrier to east-west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most roads running east or west.  - Robert Charles 'Bob' Sweikert (May 20, 1926  June 17, 1956) was an American racing driver, best known as the winner of the 1955 Indianapolis 500 and the 1955 National Championship, as well as the 1955 Midwest Sprint car championship - the only driver in history to sweep all three in a single season.  - 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.  - William John "Bill" Vukovich, Sr. (Serbian: Bil Vukovi,  ; December 13, 1918  May 30, 1955) was a Serbian American automobile racing driver. He won the 1953 and 1954 Indianapolis 500 plus two more American Automobile Association National Championship races. Several drivers of his generation have referred to Vukovich as the greatest ever encountered in American motorsport.    After reading the paragraphs above, we are interested in knowing the entity with which '1955 aaa championship car season' exhibits the relationship of 'sport'. Find the answer from the choices below.  Choices: - motorsport  - running  - spanish  - sprint  - united kingdom
Answer:
motorsport