Classify the input text into either disfluent questions or proper questions. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
--------
Question: What vitamin excuse me What gene is expressed by the B-cell?

Answer: disfluent

Question: According to Lenin why must capitalistic countries not have an imperialistic policy?

Answer: proper

Question: What is volume normally as concentrated as?

Answer:
proper