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: Does neo/adjuvant chemotherapy improve outcome in resected primary synovial sarcoma : a study of the French Sarcoma Group?
Answer: As for other high-grade soft-tissue sarcomas, well-planned wide surgical excision with adjuvant radiotherapy remains the cornerstone of treatment for SS. Neo-adjuvant or adjuvant chemotherapy should not be delivered outside a clinical trial setting.

Output: no


Input: Consider Input: Question: Does interaction of programmed death-1 and programmed death-1 ligand-1 contribute to testicular immune privilege?
Answer: The constitutive expression of PD-L1 in the testis is an important mechanism underlying testicular immune privilege and long-term survival of intratesticular islet allografts.

Output: yes


Input: Consider Input: Question: Does normalization of esophageal pH with high-dose proton pump inhibitor therapy result in regression of Barrett 's esophagus?
Answer: Although symptoms improved, erosive esophagitis healed, and squamous islands increased, there was no significant decrease in the length of Barrett's esophagus. Control of esophageal pH alone is not sufficient for the reversal of Barrett's esophagus.


Output: no