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.

Example Input: Question: Is cytoplasmic expression of -catenin an independent predictor of progression of conventional renal cell carcinoma : a simple immunostaining score?
Answer: Cytoplasmic -catenin expression is an independent prognostic factor for conventional RCC, and may help to identify patients with a high risk of cancer-specific death and to direct optimized active surveillance or adjuvant therapy.
Example Output: yes

Example Input: Question: Does extended pattern prostate biopsy minimize the volume-grade bias in prostate cancer detection?
Answer: Although more high grade cancers are detected with extended pattern biopsy, there is no differential upgrading with respect to prostate volume. Based on these observations extended prostate sampling in trials of agents that decrease prostate volume would have minimal impact on volume-grade associations.
Example Output: no

Example Input: Question: Does removal of the superficial zone of bovine articular cartilage increase its frictional coefficient?
Answer: The topmost ( approximately 100 microm) superficial zone of articular cartilage does not have special properties which enhances its frictional response.
Example Output:
no