In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: What normal bodily occurrence can cause skeletal muscles to involuntarily contract? Answer: reflexes

A: Reflexes normal bodily occurrence can cause skeletal muscles to involuntarily contract.
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Q: Question: Which unit is used to express the amount of energy in food? Answer: Calorie

A: A calorie is used to express the amount of energy in food.
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Q: Question: What is the most common cause of cancer? Answer: cell mutations

A:
Cell mutations is the most common cause of cancer.
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