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: Does pentoxifylline prevent neither liver damage nor early profibrogenic events in a rat model of non-alcoholic steatohepatitis?
Answer: PTX does influence neither liver injury nor early profibrogenic events in the CDD model of NASH.
Output:
no