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

[Q]: Aldebaran is the brightest star in which constellation?
[A]: aldebaran


[Q]: In which war did the Sack of Badajoz takeplace?
[A]: siege of badajoz


[Q]: Known as the Gentle Giant, name the breed of dog that is recognized as the tallest of all dogs?
[A]:
dog