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

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

Which film director won the Oscar for Best Picture for the film 12 Years a Slave in 2013?
12 years a slave

Who owned the black labrador that was killed on the evening of the Dam Busters raid?

operation chastise