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

Example Input: Who married the woman who was to become Queen Beatrix of the Netherlands, on 10 March 1966?
Example Output: beatrix

Example Input: Which English comedian has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?
Example Output: britain's got talent

Example Input: The youngest person in the world to earn $1,000,000,000, who is the CEO, President, and Co-founder of Facebook?
Example Output:
facebook