TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which alliteratively-named politician served as Abraham Lincoln's Vice-President between 1861 and 1865?

SOLUTION: abraham lincoln

PROBLEM: Which horse won the 2008 Grand National?

SOLUTION: 2008 grand national

PROBLEM: In which country is the Bendorf bridge?

SOLUTION:
bendorf