TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What is the name of the US electric car manufacturer, founded in 2003, whose cars include the Model S and the Model X?

SOLUTION: tesla model s

PROBLEM: In 2011, Christian Bale won a Best Supporting Actor Oscar for his role as an assistant to his half-brother in which boxing related film?

SOLUTION: christian bale

PROBLEM: Which American President once famously proclaimed `Ich bin ein Berliner`?

SOLUTION:
ich bin ein berliner