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.
Input: Question: Is fixation of the access-port required in gastric banding?
Answer: This study shows non-fixation of the access-port to be safe and effective with good patient acceptability. In addition, it avoids the need for regular X-ray localization of the port.
Output:
no