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

Example Input: Although it was headquartered at Oak Ridge, TN, and the University of Chicago, what was the name of the WWII project that created the atomic bomb?
Example Output: nuclear weapon

Example Input: What is the SI unit of capacitance?
Example Output: capacitance

Example Input: Who was the first Olympic heavyweight boxing gold medallist to become world professional heavyweight boxing champion?
Example Output:
boxing