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

Example Input: In which bay is Alcatraz?
Example Output: alcatraz island

Example Input: Which alliteratively-named politician served as Abraham Lincoln's Vice-President between 1861 and 1865?
Example Output: abraham lincoln

Example Input: What is the name of the estuary north of Bordeaux in SW France, formed by the confluence of the Garonne and Dordogne rivers ?
Example Output:
bordeaux