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.

Example Input: Question: Are flexible magnets effective in decreasing pain perception and recovery time after muscle microinjury?
Answer: No significant therapeutic effects on pain control and muscular dysfunction were observed in subjects wearing flexible magnets.
Example Output: no

Example 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.
Example Output: no

Example Input: Question: Does the long-term use of soap affect the pH-maintenance mechanism of human skin?
Answer: These results suggest that long-term continuous use of a soap-based cleanser does not affect the pH-maintaining mechanism of human skin.
Example Output:
no