In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
--------
Question: Sentence: The ears are an external feature in human beings is responsible for balance. Question: What external feature in human beings is responsible for balance?

Answer: ears


Question: Sentence: Droughts occurs when there is little to no rain in a period of time. Question: What occurs when there is little to no rain in a period of time?

Answer: droughts


Question: Sentence: Cnidarians class of animal, including hydras and jellies, is considered the simplest to contain a nervous system. Question: What class of animal, including hydras and jellies, is considered the simplest to contain a nervous system?

Answer:
cnidarians