Detailed Instructions: 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.
Problem:Question: Is intrathecal addition of morphine to bupivacaine the cause of postoperative nausea and vomiting?
Answer: Administration of metoclopramide did not reduce the overall incidence of PONV. Our study shows no relationship between the use of intrathecal morphine and the incidence of PONV during the first 24 hours postoperative.
Solution:
no