A question that is free of any grammatical or logcal errors, should be labeled 'yes', otherwise it should be indicated as 'no'. A question is grammatically correct if all its entities i.e. nouns, verbs, adjectives, prepositions, pronouns, adverbs are at appropriate position. A question is logically correct if the semantic makes sense.

[EX Q]: Sentence: They then took a boat to Africa and Asia, where they went on a trip through the mountains.
Question: What time did the boat arrive?
[EX A]: Yes.

[EX Q]: Sentence: This sediment has been eroded off areas of land from upstream.
Question: Will all the sediment erode away?
[EX A]: No.

[EX Q]: Sentence: He tried and tried to please every person who came to the store, but they all picked smaller puppies.
Question: Did he still plead the next day?
[EX A]:
No.