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.

Sentence: In 1996 the WHO found that much of the population existed in a state of ``semi-starvation.''. 
Question: How often does the WHO find out facts about the population?
Yes.

Sentence: With this, it became impossible for me to stay upstairs, he said, pointing to the scars on his forearm. 
Question: When did he get his scars?
No.

Sentence: While these laws were met with skepticism and ridicule, they've often become standard practice in other states. 
Question: When were the laws first introduced?

Yes.

