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.

[Q]: What caused the Lower Rhine region to be changed significantly?
[A]: proper


[Q]: What antibody er uh what people are least vulnerable to infection?
[A]: disfluent


[Q]: When was the first geological map of the U.S produced no sorry of the entire earth not just the U.S?
[A]:
disfluent