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 anti-cholinergic drug doesn't cross the blood brain barrier and placenta? 
Select and explain. 
A. Glycopyrrolate bromide, B. Hyoscine bromide, C. Hyoscine butylbromide, D. Atropine
A: Glycopyrrolate bromide
Answer: A: Glycopyrrolate bromide 
Explanation: None