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
Saliva is increased by: 
Select and explain. 
A. Cholinergic drugs, B. Anticholinergic drugs, C. Adrenergic drugs, D. None of the above
A: Cholinergic drugs
Answer: A: Cholinergic drugs 
Explanation: None