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: Pharmacology
Which of the following is not a teiary amine derivative? 
Select and explain. 
A. Atropine, B. Glycopyrrolate, C. Scopolamine, D. Hyoscine
A: Atropine
Answer: A: Atropine 
Explanation: Ans. b. Glycopyrrolate Glycopyrrolate is a synthetic quaternary anticholinergic drug, which doesn't cross the blood brain barrier and completely lacks central effects.