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

[Q]: Thereze Bazar and David van Day were better known as which duo?
[A]: david van day


[Q]: Which singer/songwriter, who began releasing hit singles in 1958, has had 3 albums (The Definitive Collection, Waking Up Is Hard to Do & The Music of My Life) on Billboard's Top 200 Albums chart between 2007 & 2010?
[A]: the definitive collection


[Q]: The chemical element cobalt is a?
[A]:
cobalt