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

Input: Consider Input: What is the main river of Brazil?

Output: brazil


Input: Consider Input: What name was given to the 1950-60s mainstream country music style of artists including Patsy Cline, Tammy Wynette, Jim Reeves, and Charlie Rich?

Output: charlie rich


Input: Consider Input: The US citizenship of which American Civil War General was restored in 1975?


Output: american civil war