input question: Determine the topic of the question. Question: "what is a constant in math??" Topic:???
output answer: Mathematical constant

input question: Determine the topic of the question. Question: "when does air bag deploy?" Topic:???
output answer: Airbag

input question: Determine the topic of the question. Question: "how many presidents of the us?" Topic:???
output answer: List of Presidents of the United States

input question: Determine the topic of the question. Question: "what composer used sound mass?" Topic:???
output answer:
Sound mass