This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': "Snyder's test measures \nSelect and explain. \nA. Amount of acid produced, B. Number of new caries lesion, C. Buffering action of saliva, D. Antibiotic activity of saliva", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]