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: Do mast cells contribute to nonsteroidal anti-inflammatory drug-induced gastric mucosal injury in rodents?
Answer: Mast cells do not play a significant role in the development of gastric injury induced by acute NSAID administration in the rat or mouse.
Output:
no