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.

Example Input: What is the system of many biological structures and processes that protect an organism from cold?
Example Output: proper

Example Input: What is one of the minor functions of the IPCC?
Example Output: proper

Example Input: What are refineries often called?
Example Output:
proper