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 actress played the part of Angie in EastEnders?

SOLUTION: angie watts

PROBLEM: Aldebaran is the brightest star in which constellation?

SOLUTION: aldebaran

PROBLEM: Which German philosopher wrote 'Das Kapital'?

SOLUTION:
capital: critique of political economy