instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
In which city will the 2014 Tour de France begin?
answer:
2014 tour de france


question:
In which Shakespeare play do the characters Ajax, Achilles and Ulysses appear?
answer:
achilles


question:
Which actor was first to play `Dr Who` on TV?
answer:

doctor who