TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Krist Novoselic and Dave Grohl were two thirds of which band, formed in Aberdeen (Washington State) whose albums include Bleach and In Utero?

SOLUTION: dave grohl

PROBLEM: Which alliteratively-named politician served as Abraham Lincoln's Vice-President between 1861 and 1865?

SOLUTION: abraham lincoln

PROBLEM: 'Now what I want is, Facts' is the opening line of which Charles Dickens novel?

SOLUTION:
charles dickens