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: Is better survival in women with resected hepatocellular carcinoma related to tumor proliferation or expression of hormone receptors?
Answer: Women with HCC had significantly better survival and lower tumor recurrence rates. However, significant differences in cellular proliferation indices and expression of ER and PR were not observed between men and women to explain the difference in survival rate.
Output:
no