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

Example Input: Andy Schleck competes in what sport at an international level?
Example Output: andy schleck

Example Input: What was Paul McCartney's first solo album called?
Example Output: album

Example Input: Who is the next in this series: Nelson Rockefeller, Walter Mondale, George H. W. Bush, Dan Quayle, Al Gore ... ?
Example Output:
george h. w. bush