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.

Example Input: Question: Does fK778 attenuate cytomegalovirus-enhanced vein graft intimal hyperplasia in a rat model?
Answer: These data suggest a role of CMV in venous graft failure. Also, our results suggest a prospective role for the new immunosuppressive drug FK778 in the prevention of (CMV-mediated) vein graft intimal hyperplasia.
Example Output: yes

Example Input: Question: Is cardiac autonomic neuropathy in patients with uraemia related to pre-diabetes?
Answer: The prevalence of CAN and impaired glucose tolerance is high in uraemic patients, but impaired glucose tolerance seems to play no significant role in the aetiology of CAN in uraemic patients.
Example Output: no

Example Input: Question: Are lower serum brain-derived neurotrophic factor levels associated with failure to achieve remission in patients with major depression after escitalopram treatment?
Answer: This study included a small sample, and measured serum BDNF levels in the MDD patients at only one point during the maintenance treatment.
Example Output:
yes