Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: In which religion is there one god called Ahura Mazda?

Answer: ahura mazda

Question: Which former Portuguese African Colony joined the British Commonwealth in 1995?

Answer: commonwealth of nations

Question: Abbotsford House, on the banks of the Tweed, was the home of which author?

Answer:
abbotsford house