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: The headquarters building of which government agency is known as 'The Doughnut' due to its shape?

SOLUTION: the doughnut

PROBLEM: In which country was the 1990 FIFA World Cup held?

SOLUTION:
1990 fifa world cup