This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Which of the following drugs does not cross blood placental barrier? \nSelect and explain. \nA. Atropine, B. Glycopyrrolate, C. Physostigmime, D. Hyoscine hydro bromide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) Glycopyrrolate(Ref: KDT 8th/e p124)Glycopyrrolate is a quarternary ammonium compounds and is thus water soluble and unable to penetrate BBB.', 'role': 'assistant'}]