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 European country has the Cupon as its currency?

SOLUTION: moldovan cupon

PROBLEM: Bituminous and anthracite are types of what?

SOLUTION:
anthracite