instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What was Paul McCartney's first solo album called?
answer:
album


question:
In 2011, Christian Bale won a Best Supporting Actor Oscar for his role as an assistant to his half-brother in which boxing related film?
answer:
christian bale


question:
Who was the first and only President of the Confederate States of America?
answer:

president of the confederate states of america