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

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

Example Input: In what story of Arthur C. Clarke do Tibetan monks seek to list all the names of God as they believe He will bring the Universe to an end once this is done?
Example Output: arthur c. clarke

Example Input: The Greek tragedians Aeschylus, Sophocles and Euripides wrote dramas dealing with which legendary woman?
Example Output:
aeschylus