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

Example input: Who was the first American President?
Example output: president of the united states
Example explanation: The question talks about the president of the USA.
Q: Who was Commander-in-Chief of American ground forces in planning the invasion of France in 1944 and Commander of the US 1st Army on D Day?
A:
normandy landings