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:
scientists found their Y. pestis sample where?
answer:
disfluent


question:
When is the latest known reference to immunity?
answer:
proper


question:
The term imperialism has never been applied to western countries, and which eastern county?
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
proper


