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: Blood enters the heart in atria valve. Question: Blood enters the heart in what valve?
atria

Sentence: Triad is the arrangement of a t-tubule with the membranes of sr on either side called. Question: What is the arrangement of a t-tubule with the membranes of sr on either side called?
triad

Sentence: Second is the smallest unit of time commonly based on. Question: What is the smallest unit of time commonly based on?

second