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: Which sprinter lit the Olympic flame at the 2000 Summer Olympic Games in Australia?

Answer: 2000 summer olympics

Question: In which recent film does Benedict Cumberbatch play Alan Turing?

Answer:
cumberbatch