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: Estradiol causes the endometrium to thicken during a menstrual cycle. Question: What causes the endometrium to thicken during a menstrual cycle?
Example Output: estradiol

Example Input: Sentence: Volcanic gases helpe to form the atmosphere on earth. Question: What did volcanic gases help to form on earth?
Example Output: atmosphere

Example Input: Sentence: Are vesicles larger or smaller than vacuoles? Question: Are vesicles larger or smaller than vacuoles?
Example Output:
smaller