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

Ex Input:
What is the Army equivalent to a Group Captain in the R.A.F.?

Ex Output:
british army


Ex Input:
The Trinity test site, outside of Alamogordo, NM, saw the first test of the atomic bomb on July 16, 1945. Headed by J. Robert Oppenheimer, what was the name of the project that developed the bomb?

Ex Output:
j. robert oppenheimer


Ex Input:
What was the name of the character played by Michael J Fox in the Back To The Future series of films?

Ex Output:

back to the future