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: 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?
[EX A]: Yes.

[EX Q]: Sentence: At NEADS, the report of the hijacking was relayed immediately to Battle Commander Colonel Robert Marr.
Question: How long did it take to relay the threat?
[EX A]: Yes.

[EX Q]: Sentence: Durer rejected Alberti's concept of an objective beauty, proposing a relativist notion of beauty based on variety.
Question: How often are philosophical concepts rejected?
[EX A]:
Yes.