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

[Q]: What country has an official residence called Blair House, kept for guests of the leader of the country?
[A]: blair

[Q]: Chris Martin is the lead singer with which band who had several hits in the 2000s?
[A]: chris martin

[Q]: What was the alter ego of Music Hall comedian Arthur Lucan in the inter-war years?
[A]:
arthur lucan