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.

Ex Input:
Question: Is prooxidant-anti-oxidant balance associated with extent of coronary artery disease?
Answer: In conclusion, we found higher levels of oxidative stress in CAD+ patients compared to healthy subjects. The oxidation level was not related to measures of the extent of CAD such as number of stenosed vessels.

Ex Output:
no


Ex Input:
Question: Is histamine released in acute thermal injury in human skin in vivo : a microdialysis study?
Answer: Histamine is not released in human skin during the acute phase of a thermal injury.

Ex Output:
no


Ex Input:
Question: Does supplementary cleaning remove protein deposits from re-usable laryngeal mask devices?
Answer: Supplementary cleaning using a rotating brush, plaque or protein removing solution does not facilitate removal of protein deposits from re-usable LMAs; however, the infectious risk associated with the protein deposits remains to be determined.

Ex Output:

no