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 the Drosophila Chmp1 protein determine wing cell fate through regulation of epidermal growth factor receptor signaling?
Answer: Drosophila Chmp1 negatively regulates DER signaling, likely through its role in MVB formation. Loss of Chmp1 activity in the Drosophila wing induces a cell fate change from intervein to vein that should provide a useful tool for future studies of ESCRT protein activity.
Example Output: yes

Example Input: Question: Is pKC a negative regulator of PVAT-derived vessel formation?
Answer: PKC negatively interferes with vessel progenitor differentiation via interaction with PAK-1.
Example Output: yes

Example Input: Question: Is [ Cholinesterase activity parallel to symptoms in patients suffering from organophosphorous pesticide poisoning through skin or by gastrointestinal tract ]?
Answer: With the same level of enzymatic activity of cholinesterase, the symptoms of the patients poisoned via gastrointestinal tract are more serious than poisoning through skin, and the quantity of atropine is used very much more. Reactivation of the cholinesterase is earlier in patients poisoned by skin route.
Example Output:
no