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
[{'content': 'Blood brain barrier is crossed by: a) Dopamine b) Propranolol c) Glycopyrrolate d) Physostigmine e) Streptomycin \nSelect and explain. \nA. abcd, B. bcde, C. ad, D. bd', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]