This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
[{'content': 'Vasponstricator L.A. is \nSelect and explain. \nA. Cocaine, B. Procaine, C. Lidocaine, D. Chlorprocain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All local anaesthetics are vasodilators except cociane which is a vasoconstrictor', 'role': 'assistant'}]