Problem: Given the question: Determine the topic of the question. Question: "what is cta used for?" Topic:
++++++++++++++++++++++++++++++++
The answer is:
Computed tomography angiography

input question: Determine the topic of the question. Question: "what happened to stevie ray vaughan?" Topic:???
output answer: Stevie Ray Vaughan

Determine the topic of the question. Question: "what is black hairy tongue disease?" Topic:
----
Answer: Black hairy tongue

Q: Determine the topic of the question. Question: "who does chris humphries play for?" Topic:
A: Kris Humphries

Question: Determine the topic of the question. Question: "when did playstation 3 first launch?" Topic:
Answer: PlayStation 3 launch

Please answer this: Determine the topic of the question. Question: "what is feedback mechanism in plants during respiration?" Topic:
++++++++
Answer:
Cellular respiration