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

Q: Which two brothers had hits with Cathy's Clown and Wake Up Little Susie?

A: cathy's clown
****
Q: Which alliteratively-named politician served as Abraham Lincoln's Vice-President between 1861 and 1865?

A: abraham lincoln
****
Q: Which musical was based on the life of Annie Oakley?

A:
annie oakley
****