Given the task definition and input, reply with output. 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: Is codeine and clinical impairment in samples in which morphine detected?
Answer: Codeine appeared to have some dose-dependent effect on the central nervous system that may lead to impairment as judged from a CTD, independent of measurable blood morphine concentrations. This supports the view that some codeine effects do not seem to be mediated by morphine.
no