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: Drugs can start or no elicit a neutralizing immune response at what size and larger?

Answer: disfluent


Question: When is the latest known reference to immunity?

Answer: proper


Question: Who governs Nobel Prize central bank no sorry who is the current Chairman of President Barack Obama's Council of Economic Advisors?

Answer:
disfluent