Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[Q]: Who has taken over the TV role of Doctor Who, from actor David Tennant?
[A]: doctor who


[Q]: Who won the men`s gold medal for ice-figure skating at the 1980 Winter Olympics?
[A]: 1980 winter olympics


[Q]: Who was the next British Prime Minister after Arthur Balfour?
[A]:
prime minister of the united kingdom