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.

Example Input: Sentence: Muscles need stimulus to contract. Question: What do muscles need to contract?
Example Output: stimulus

Example Input: Sentence: For an exothermic chemical reaction, energy is given off as reactants are converted to products. Question: For an exothermic chemical reaction, energy is given off as reactants are converted to what?
Example Output: products

Example Input: Sentence: The brain stem monitor(s) the level of carbon dioxide in the blood. Question: What monitors the level of carbon dioxide in the blood?
Example Output:
the brain stem