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: Consider Input: Question: Is histamine released in acute thermal injury in human skin in vivo : a microdialysis study?
Answer: Histamine is not released in human skin during the acute phase of a thermal injury.

Output: no


Input: Consider Input: Question: Has survival after recurrent esophageal carcinoma improved over the past 18 years?
Answer: Survival after recurrent EC in patients who undergo FU without routine imaging after esophagectomy is approximately 3 months and has not improved over the past 18 years.

Output: no


Input: Consider Input: Question: Does magnesium sulfate potentiate morphine antinociception at the spinal level?
Answer: Magnesium sulfate potentiates morphine analgesia when coadministered intrathecally in normal rats, and in an animal model of mechanical allodynia after a surgical incision. These results suggest that intrathecal administration of magnesium sulfate may be a useful adjunct to spinal morphine analgesia.


Output: yes