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

Dora Maar au Chat and The Weeping Woman are both portraits by which artist of his lover?
dora maar au chat

Who is the only British Prime Minister to serve under 3 monarchs?
prime minister of the united kingdom

The Ashmolean Museum is in which English city?

ashmolean museum