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

Example Input: Who was Domenikos Theotocopoulos better known as?
Example Output: museum of el greco

Example Input: With which song did Swedish pop group Abba win the 1974 Eurovision Song Contest?
Example Output: abba

Example Input: 'Beatrice et Benedict' is an opera by Berlioz, based on which play by Shakespeare?
Example Output:
beatrice et benedict