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: The chains in cellulose stack in parallel rows held together by hydrogen bonds between hydroxl groups groups. Question: The chains in cellulose stack in parallel rows held together by hydrogen bonds between which groups?
Example Output: hydroxl groups

Example Input: Sentence: The epidermis of a leaf contains openings known as stomata, through which the exchange of gases takes place. Question: Which part of a leaf contains openings known as stomata, through which the exchange of gases takes place?
Example Output: epidermis

Example Input: Sentence: Oldest crust lies deep inside the ocean. Question: Which crust lies deep inside the ocean?
Example Output:
oldest