Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: Who painted The Card Players, at Feb 2012 the most expensive artwork in the world?

Answer: the card players


Question: In which constellation is the star Deneb?

Answer: deneb


Question: At what location, the largest of its type, were the German actors Max Ehrlich, Kurt Gerron and Dora Gerson all murdered?

Answer:
kurt gerron