This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional Anesthesia, Subject name: Anaesthesia
[{'content': 'All true about - cocaine except- \nSelect and explain. \nA. It is amide local anesthetics, B. It can produce sympathetic stimulation, C. It is metabolized by liver, D. It blocks the presynaptic uptake of norepinephrine and dopamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is ester local anesthetics Cocaine was the first local Anesthetic to be used clinically. It is only natural local anesthetic. Koller introduced this in the field of ophthalmology. It is the only local anesthetic with vasoconstrictor action. It is sympathomimetic and inhibits metabolism of catecholamine.', 'role': 'assistant'}]