TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Charlie Chaplin who died on Christmas Day in 1977, co founded which film studio along with Mary Pickford, Douglas Fairbanks?

SOLUTION: douglas fairbanks

PROBLEM: Who released the albums Sentimental Journey, Goodnight Vienna, Bad Boy, Old Wave and Vertical Man between 1970 and 1999?

SOLUTION: vertical man

PROBLEM: Who famously proclaimed 'Ich bin ein Berliner' on 26 June 1963?

SOLUTION:
ich bin ein berliner