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'.

Sentence: Atta and Omari boarded a 6:00 A.M. flight from Portland to Boston's Logan International Airport.
Question: What happened after the plane took off?
Yes.

Sentence: The dog accompanied him, frisking about him in friendly fashion.
Question: Was the dog happy?
Yes.

Sentence: The Persian Gulf War destroyed much of the country's medical infrastructure, according to a report by the World Health Organization.
Question: How often did the Persian Gulf War take place?
Yes.