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

Who is the most famous cartoon creation of Chester Gould?
chester gould

What is the official language of the Dominican Republic?
dominican republic

What is the name of the major Greek stadium in Athens that was the venue for the opening and closing ceremonies, athletics events and the football (soccer) final at the 2004 Summer Olympics?
athens