Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
--------
Question: Eden Park staged some of the 2011 Rugby World Cup matches, in which city can it be found?

Answer: eden park


Question: On January 26, 1879, who was granted a patent for r an electric lamp using a carbon filament or strip coiled and connected to platina contact wires?

Answer: incandescent light bulb


Question: Which US state was the title of a no. 1 hit for the Bee Gees in 1967?

Answer:
bee gees