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

[Q]: 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?
[A]: incandescent light bulb


[Q]: What is the second book of the Bible?
[A]: bible


[Q]: Who played Martha Jones in the UK tv series Doctor Who?
[A]:
martha jones