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 title of the four-episode special of 'Doctor Who', made for the Red Nose Day telethon in the UK, broadcast in March 1999?

SOLUTION: doctor who

PROBLEM: Which female gymnast won Gold Medals in the Balance Beam and Floor Exercise events in the 1972 Summer Olympics?

SOLUTION: 1972 summer olympics

PROBLEM: The lack of calcium in the diet causes what condition?

SOLUTION:
calcium