instruction:
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 did lower material living standards lead to for most of human history?
answer:
proper


question:
In what year did the plague begin in England?
answer:
proper


question:
Who was the first Cetrum President?
answer:

proper