Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Input: Consider Input: Fact: heat is detected by sensory nerve cells. 
Question: What is detected by sensory nerve cells?

Output: heat.


Input: Consider Input: Fact: Shrews generate the most heat by keeping their metabolic rate high. 
Question: What metabolic rate does a shrew have?

Output: High rate.


Input: Consider Input: Fact: a meter stick can be used to measure feet. 
Question: What can be used to measure feet?


Output: a meter stick.