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

Which English classic horse race for 3 year olds held at Doncaster every September began in 1776?
doncaster racecourse

Who played Captain Jean-Luc Picard in the television series 'Star-Trek: The Next Generation'?
jean-luc picard

Who played Bernardo O'Reilly in the 1960 film 'The Magnificent Seven'?

the magnificent seven