Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: What is the Army equivalent to a Group Captain in the R.A.F.?

Answer: british army


Question: Cinder Cone, composite, and shield are all types of what?

Answer: cinder cone


Question: 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?

Answer:
j. robert oppenheimer