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.

Question: What do you call sound that has a wave frequency higher than the human ear can detect? Answer: ultrasound
You call sound that has a wave frequency higher than the human ear can detect ultrasound.

Question: For what purpose does liver use the excess carbohydrate? Answer: to synthesize glycogen
For to synthesize glycogen purpose does liver use the excess carbohydrate.

Question: What type of acid is often used as a preservative for acidic foods such as fruit juices? Answer: benzoic acid

Benzoic acid type of acid is often used as a preservative for acidic foods such as fruit juices.