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: The esophagus runs a mainly straight route through the mediastinum of what? Answer: thorax

A: The esophagus runs a mainly straight route through the mediastinum of thorax.
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Q: Question: What do you call sound that has a wave frequency higher than the human ear can detect? Answer: ultrasound

A: You call sound that has a wave frequency higher than the human ear can detect ultrasound.
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Q: Question: What kind of attraction does electrical force have? Answer: negative

A:
Electrical force has negative attraction.
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