input question: Determine the topic of the question. Question: "when does a demand curve shift??" Topic:???
output answer: Demand curve

Determine the topic of the question. Question: "what creates sonic boom?" Topic:
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Answer: Sonic boom

Q: Determine the topic of the question. Question: "what is the lowest temperature ever recorded in antarctica?" Topic:
A: Climate of Antarctica

Question: Determine the topic of the question. Question: "what area code is 479?" Topic:
Answer: Area code 479

[Q]: Determine the topic of the question. Question: "what is a fret on a guitar?" Topic:
****
[A]: Fret

Problem: Given the question: Determine the topic of the question. Question: "what is blood urea?" Topic:
++++++++++++++++++++++++++++++++
The answer is:
Blood urea nitrogen