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 form of dementia is named after a German psychiatrist who first described it in 1906?
dementia

In which play does the famous All the world's a stage quote originate?

all the world's a stage