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': 'The following property of saliva affect denture retention? \nSelect and explain. \nA. Quality & Quantity of serous & mucous saliva, B. Quantity of mixed saliva, C. Quantity of only serous saliva, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]