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.

Example Input: Sentence: Our investigation has uncovered no credible evidence that any person in the United States gave the hijackers substantial financial assistance. 
Question: How long did the investigation span?
Example Output: Yes.

Example Input: Sentence: So really, that's what many of the people are doing now,"" he said. 
Question: What did they done when they were done?
Example Output: No.

Example Input: Sentence: On Fridays, Billy answers in a loud voice and Sally in a quiet voice. 
Question: What day does Susie answer in a loud voice?
Example Output:
No.

