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 serum creatine kinase a reliable indicator of ectopic pregnancy?
Answer: Although the mean value of serum creatine kinase is statistically significantly higher in ectopic pregnancy relative to controls, the distribution curve for creatine kinase values for ectopics is broad, with much overlap with the control curve. Hence, the sensitivity and positive predictive value for this test is poor.
no