Q: 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: Do beta-blockers before percutaneous coronary intervention attenuate postprocedural creatine kinase isoenzyme rise?
Answer: The results of this large observation study do not support the contention that BB use before PCI decreases myocardial injury.
A:
no