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

Ex Input:
In which book of the Bible are the Ten Commandments first mentioned?

Ex Output:
bible


Ex Input:
In which religion is there one god called Ahura Mazda?

Ex Output:
ahura mazda


Ex Input:
What is the title of the last UK number one hit for Swedish group Abba?

Ex Output:

abba