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.

[EX Q]: Sentence: Cloud of these can make a shadow on the ground during the day. Question: Which of these can make a shadow on the ground during the day?
[EX A]: Cloud

[EX Q]: Sentence: Air weakly scatters visible light. Question: What weakly scatters visible light?
[EX A]: air

[EX Q]: Sentence: Calcium ion is an example of a second messenger. Question: Calcium ion is an example of what kind of messenger?
[EX A]:
second