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.

Sentence: The thick skin, found only on the palms of the hands and the soles of the feet, has an extra layer. Question: The thick skin, found only on the palms of the hands and the soles of the feet, has an extra what?
layer

Sentence: The potential of galvanic cell can be used to measure the ph of a solution. Question: The potential of what can be used to measure the ph of a solution?
galvanic cell

Sentence: Element is the basic chemical building block of matter; it is the simplest chemical substance. Question: What is the basic chemical building block of matter; it is the simplest chemical substance?
element