Given the task definition and input, reply with output. 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).

Context: The 1952 Swiss Grand Prix was a Formula Two race held on 18 May 1952 at Bremgarten Circuit . It was the first round of the 1952 World Drivers ' Championship , which was run to Formula Two rules in 1952 and 1953 , rather than the Formula One regulations normally used . Pre-WWII Grand Prix great Rudolf Caracciola crashed heavily during a support sports car race . He survived with a broken leg , but this crash effectively ended his racing career . He was driving a Mercedes 300SL ; his brakes locked up going into a corner and the car skidded off the road and hit a tree . Italian driver Piero Taruffi scored his only win in a World Championship race , driving for Ferrari ., Formula racing is any of several forms of open-wheeled single-seater motorsport. The origin of the term lies in the nomenclature that was adopted by the FIA for all of its post-World War II single-seater regulations, or formulae. The best known of these formulae are Formula One, Two, Three and Four. Common usage of "formula racing" encompasses other single-seater series, including the GP2 Series, which replaced Formula 3000 (which had itself been the effective replacement for Formula Two)., Formula 3000 was a type of open wheel, single seater formula racing, occupying the tier immediately below Formula One and above Formula Three. It was so named because the cars were powered by 3000 cc engines., Formula Two, abbreviated to F2, was a type of open wheel formula racing first codified in 1948. It was replaced in 1985 by Formula 3000, but revived by the FIA from 20092012 in the form of the FIA Formula Two Championship., The FIA Formula Two Championship was a one-make class of auto racing for Formula Two open wheeled single seater racing cars. It was a revival of the former European Formula Two Championship that was previously run from 1967 to 1984, and was organised by MotorSport Vision. Drivers competed in identical Williams F1 built cars with an Audi supplied and Mountune Racing developed 400 bhp engine, over 16 rounds at eight venues., Subject: 1952 swiss grand prix, Relation: sport, Options: (A) auto racing (B) formula one (C) formula two (D) motorsport
auto racing