Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Input: Consider Input: What American swimmer won eight gold medals at the 2008 Olympics?

Output: 2008 summer olympics

Input: Consider Input: Who has taken over the TV role of Doctor Who, from actor David Tennant?

Output: doctor who

Input: Consider Input: In Greek mythology, who was given the gift of prophecy by Apollo, who changed the blessing to a curse because she would not accept Apollo as her lover, causing her prophecies never to be believed?
Output: apollo