Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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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: Alexander the Great died in which ancient city?

Answer: alexander the great


Question: Where was the venue for the Commonwealth Games in 2010?

Answer:
2010 commonwealth games