The answer will be 'yes' if the provided sentence contains an explicit mention that answers the given question. Otherwise, the answer should be 'no'. Instances where the answer is implied from the sentence using "instinct" or "common sense" (as opposed to being written explicitly in the sentence) should be labeled as 'no'.
One example is below.
Q: Sentence: Jack played basketball for an hour after school, after which he was very tired. 
Question: How long did Jack play basketball?
A: Yes.
Rationale: The answer to this question (an hour)  lies in its text.
Q: Sentence: Our investigation has uncovered no credible evidence that any person in the United States gave the hijackers substantial financial assistance. 
Question: What happens after the hijackers are caught?
A:
No.