This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
[{'content': 'All these EXCEPT one cross the blood-brain barrier: \nSelect and explain. \nA. Morphine, B. Dopamine, C. Propranolol, D. Ether', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dopamine does not cross BBB. Hence it is administered as levodopa levodopa is the prodrug which is conveed to dopamine in the brain Pg.no.425 K D Tripathi Seventh edition', 'role': 'assistant'}]