Definition: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
Input: Which constellation, that lies between Taurus to the west and the dim Cancer to the east, with Auriga and Lynx to the north and Monoceros and Canis Minor to the south, is associated with the myth of Castor and Pollux, collectively known as the Dioscuri?
Output:
cancer