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: Is diffuse musculoskeletal pain associated with low vitamin D levels or improved by treatment with vitamin D?
Answer: Low vitamin D levels are not associated with diffuse musculoskeletal pain, and treatment with vitamin D does not reduce pain in patients with diffuse pain who have low vitamin D levels.
Example Output: no

Example Input: Question: Does students ' Interest in Surgery affect Laparoscopic Practicing Performance?
Answer: Those clerks and interns interested in surgery who had more sessions for self-guided practice, displayed more improvement than those not interested in surgery did. Improvement in performance correlated highly with trainees' number of self-guided practice sessions.
Example Output: yes

Example Input: Question: Do visual analog pain scores define desire for analgesia in patients with acute pain?
Answer: The visual analog scale cannot adequately discriminate between those patients who do and do not desire analgesia.
Example Output:
no