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.

[Q]: Sentence: So really, that's what many of the people are doing now,"" he said. 
Question: When did they begin doing it?
[A]: Yes.


[Q]: Sentence: After finally sleeping with Lucrezia , Callimaco confesses everything . 
Question: Was Callimaco remorseful?
[A]: No.


[Q]: Sentence: In London at mid-afternoon yesterday, Ratners's shares were up 2 pence (1.26 cents), at 260 pence ($1.64). 
Question: How long did Ratners's shares stay up?
[A]:
Yes.


