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

[EX Q]: Chris Martin is the lead vocalist and rhythm guitarist with which group?
[EX A]: chris martin

[EX Q]: What was Paul McCartney's first solo album called?
[EX A]: album

[EX Q]: Which composer wrote the 1944 oratorio A Child of our Time?
[EX A]:
a child of our time