Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Ex Input:
Question: Does exacerbation of headache during dihydroergotamine for chronic migraine alter outcome?
Answer: After controlling for nausea and other factors, headache exacerbation with DHE infusions is not an independent predictor of poor headache outcome and clinicians should not interpret its presence as a reason to stop treatment. The focus of management should be on controlling nausea as it is the most important modifiable factor in achieving a good headache outcome with an inpatient course of IV DHE for chronic migraine.

Ex Output:
no

Ex Input:
Question: Do post-ERCP pancreatitis rates differ between needle-knife and pull-type pancreatic sphincterotomy techniques : a multiendoscopist 13-year experience?
Answer: The risk of post-ERCP pancreatitis does not differ between EPS techniques when performed at a high-volume pancreaticobiliary referral center when using routine prophylactic pancreatic duct stent placement.

Ex Output:
no

Ex Input:
Question: Does late gestational intrauterine myelomeningocele repair improve lower extremity function?
Answer: Although the current timing of intrauterine myelomeningocele repair has been found to lessen the degree of herniation of the rhombencephalon and reduce the incidence of shunt-dependent hydrocephalus, it does not statistically improve LEF. Parents should be advised of these findings prior to surgical intervention so as to focus their expectations.

Ex Output:
no