This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Wich one of the following drugs does not produce central anticholinergic syndrome 
Select and explain. 
A. Atropine sulphate, B. Glycopyrrolate, C. Antihistaminics, D. Tricyclic antidepressants
B: Glycopyrrolate
Answer: B: Glycopyrrolate 
Explanation: Ref: KD Tripathi pharmacology 7th edition (page.no: 111) Glycopyrrolate is a potent and rapidly acting antimuscarinic, lacking central effects. It is having a quaternary structure. so it doesn't cause the central anticholinergic syndrome. Atropine has both central and peripheral action. Tricyclic antidepressants, Antihistaminics have central anticholinergic effects