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

Buried in neither Westminster nor Windsor, where is the tomb of Edward II?
edward ii of england

Which European country contains the ski resorts of Davos and Klosters?
klosters

Which German composed the 1911 opera 'Der Rosenkavalier'?

der rosenkavalier