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

In 1864, the Dale Dyke Dam burst while being filled, leading to the death of 240 people in which British city?
dale dike reservoir

Aldebaran is the brightest star in which constellation?
aldebaran

Another Suitcase In Another Hall is a song from which musical?

another suitcase in another hall