Definition: 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'.

Positive Example 1 -
Input: Sentence: Jack played basketball for an hour after school, after which he was very tired. 
Question: How long did Jack play basketball?
Output: Yes.

Positive Example 2 -
Input: Sentence: He was born in China, so he went to the Embassy at 1 pm to apply for a U.S. Visa. 
Question: When did he go to Embassy?
Output: Yes.

Negative Example 1 -
Input: Sentence: Jack played basketball after school, after which he was very tired. 
Question: How long did Jack play basketball?
Output: No.

Now complete the following example -
Input: 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?
Output: 


Output: Yes.