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 largest city in Bavaria?

Ex Output:
bavaria

Ex Input:
In 1951, which European country saw the abdication of King Leopold lll in favour of his son Baudouin?

Ex Output:
baudouin of belgium

Ex Input:
Who succeeded General Joseph Johnston as the Commander of the Army of Northern Virginia?

Ex Output:
army of northern virginia