instruction:
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:
Question: Do norepinephrine and ephedrine counteract the increase in cutaneous microcirculation induced by spinal anaesthesia?
Answer: Improved skin perfusion induced by spinal anaesthesia was not counteracted by the use of norepinephrine or ephedrine.
answer:
no

question:
Question: Is a gain-of-function mutation in the cardiac pacemaker HCN4 channel increasing cAMP sensitivity associated with familial Inappropriate Sinus Tachycardia?
Answer: This is the first report of a gain-of-function HCN4 mutation associated with IST through increased sensitivity to cAMP-dependent activation.
answer:
yes

question:
Question: Does herbal compound Naoshuantong capsule attenuate retinal injury in ischemia/reperfusion rat model by inhibiting apoptosis?
Answer: Our study indicated that Naoshuantong capsule attenuates retinal damage in rat models of ischemic ophthalmopathy, possibly by inhibiting apoptosis.
answer:
yes