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.
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Question: Sentence: Diggler became a prominent model and began appearing in pornographic films , after Which his career took off . 
Question: Was Diggler still a model in her 40s?

Answer: No.


Question: Sentence: The new novel takes place in a morally gray and often violent world. 
Question: Was it always  a violent place?

Answer: Yes.


Question: Sentence: A lot of poor people are not going to get served,'' she said. 
Question: When did the poor begin to lose services?

Answer:
Yes.


