Instructions: 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.
Input: Question: Does endogenous activated protein C predict hemorrhagic transformation and mortality after tissue plasminogen activator treatment in stroke patients?
Answer: A high endogenous APC level 2 h after t-PA administration is independently associated with hemorrhagic transformation and mortality in our cohort of stroke patients. Establishing any causal link for these relationships needs further research.
Output:
yes