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 [ The incidence of postoperative nausea and vomiting effected by routinely applied manual pre-oxygenation during induction of anesthesia ]?
Answer: Since neither routine pre-intubation positive pressure mask ventilation nor the medical qualification of the anesthesilogist affect the incidence of PONV neither variable needs to be taken into account in studies concerning PONV.

Output: no


Input: Consider Input: Question: Are arterial stiffness and pulse wave reflection increased in patients suffering from severe periodontitis?
Answer: The results of this study confirm the association between periodontal inflammation and increased cardiovascular risk shown by impaired vascular health in case of severe periodontitis. As impaired vascular health is a common finding in patients suffering from severe periodontal disease a concomitant routine cardiovascular evaluation may be advised.

Output: yes


Input: Consider Input: Question: Does kynurenine production mediated by indoleamine 2,3-dioxygenase aggravate liver injury in HBV-specific CTL-induced fulminant hepatitis?
Answer: Kynurenine and IFN-γ induced by the administration with HBV-specific CTL are cooperatively involved in the progression of liver injury in acute hepatitis model. Our results may lead to a new therapy for the acute liver injury caused by HBV infection.


Output: yes


