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 Input:
Sentence: California was first to require smog checks for clean air, pass anti-tobacco initiatives and bike helmets laws.
Question: Are the laws still followed in California?

Ex Output:
Yes.

Ex Input:
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 Output:
Yes.

Ex Input:
Sentence: Joe's parents are farmers and they have a huge farm with cows, chickens, and ducks.
Question: What were Joe's parents before they were farmers?

Ex Output:
Yes.