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.

Question: Is which better for gastric cancer patients , perioperative or adjuvant chemotherapy : a meta-analysis?
Answer: Perioperative chemotherapy showed improved survival compared to adjuvant chemotherapy for gastric cancer. In addition, combination chemotherapy resulted in better survival compared to monotherapy in the neoadjuvant chemotherapy regimens.
yes