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: Does electrical stimulation prior to delayed reinnervation enhance recovery in muscles of rats?
Answer: The primary factors that inhibited reinnervation and recovery following delayed reinnervation were not alleviated by the electrical stimulation during the period of muscle denervation.
Example Output: no

Example Input: Question: Is cytoplasmic expression of β-catenin an independent predictor of progression of conventional renal cell carcinoma : a simple immunostaining score?
Answer: Cytoplasmic β-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 [ Programmed death ligand 1 negatively regulate inflammatory response of chronic periodontitis ]?
Answer: The expression of PD-L1 in the periodontal tissue negativelv regulates inflammatory periodontal tissue damage.
Example Output:
yes