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
Flow rate of unstimulated saliva from the parotid gland is: 
Select and explain. 
A. 0.4ml/min, B. 0.1ml/min., C. 0.8ml/min., D. 1ml/min
A: 0.4ml/min
Answer: A: 0.4ml/min 
Explanation: None