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

[Q]: Who composed 'Belshazzar's Feast' cantata?
[A]: belshazzar's feast


[Q]: Who was the scheming wife of the Roman emperor Claudius?
[A]: claudius


[Q]: Who partnered Andy Murray to win the 2012 Olympic tennis mixed doubles silver medal?
[A]:
andy murray