You will be given a definition of a task first, then some input of the task.
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 stromal cell-derived factor-1-3 ' A polymorphism associated with decreased risk of myocardial infarction and early endothelial disturbance?
Answer: SDF1-3'A polymorphism is associated with a decreased risk of MI and early endothelial dysfunction, strongly confirming the important atherogenic role of SDF1 gene at clinical level.
Output:
yes