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

Example 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?
Example Output: incandescent light bulb

Example Input: Charles Bingley was a character in what classic Jane Austen novel?
Example Output: charles bingley

Example Input: Which South American country has borders with Bolivia, Brazil and Argentina?
Example Output:
argentina