TASK 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'.
PROBLEM: Sentence: Mr. Barco has refused U.S. troops or advisers but has accepted U.S. military aid. 
Question: When did he begin to accept the military aid?

SOLUTION: Yes.

PROBLEM: Sentence: The most powerful families thus carved out for themselves whole regions that were to become the fiefdoms of Japanese feudalism. 
Question: What happened after these regions were carved out?

SOLUTION: Yes.

PROBLEM: Sentence: Zarco and Teixeira were appointed co-go­vern­ors of Madeira, while Perestrelo was awarded Porto Santo. 
Question: How long were Zarco and Teixeira co-governors?

SOLUTION:
No.

