Definition: 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.
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.
Output:
no