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': 'Flow rate of unstimulated saliva from the parotid gland is: \nSelect and explain. \nA. 0.4ml/min, B. 0.1ml/min., C. 0.8ml/min., D. 1ml/min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]