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 did lower material living standards lead to for most of human history?
[A]: proper


[Q]: When did Warsaw Palace start to rebuild?
[A]: proper


[Q]: What was the source of the Rhine during the current last Ice Age?
[A]:
proper