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

Ex Input:
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?

Ex Output:
incandescent light bulb


Ex Input:
After Harold McMillan who was Britain's next Prime Minister?

Ex Output:
britain


Ex Input:
Which insect is responsible for transmitting the bubonic plague?

Ex Output:

bubonic plague