instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who has taken over the TV role of Doctor Who, from actor David Tennant?
answer:
doctor who


question:
The French wine growing areas of Macon, Beaujolais and Chablis are in which region?
answer:
macon


question:
Which composer wrote the operas 'The Pearl Fishers' and 'Carmen'?
answer:

carmen