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: Are fetuin-A serum levels correlated to kidney function in long-lived subjects?
Answer: Serum Fetuin A increases with age in elder individuals and subjects with the TS or SS AHSG polymorphism have lower levels of the circulating protein. No correlation with kidney function decline was observed. Other mechanisms should be investigated to explain the increase of Fetuin A with age.
A:
no