instruction:
You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
question:
Category: TRAINS 
Clue: As of 2006, you can take a 48-hr. ride between these 2 cities, with a stretch on the world's highest railroad
answer:
beijing & lhasa


question:
Category: PLAYS 
Clue: Based on a myth, this 1913 play became a 1938 movie, a 1956 stage musical & a 1964 movie musical
answer:
pygmalion


question:
Category: FICTION 
Clue: This 1953 novel contains the famous recipe 3 measures of Gordon's, 1 of vodka; shake it until it's ice-cold
answer:

casino royale