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: Pathology
Most common cause of dry mouth in adults is 
Select and explain. 
A. Tranqulizers, B. Antihistaminics, C. Insulin, D. Birth control pills
B: Antihistaminics
Answer: B: Antihistaminics 
Explanation: None