This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Local and Regional Anesthesia), Subject name: Anaesthesia
[{'content': 'Vasoconstriction is seen with \nSelect and explain. \nA. Lignocaine, B. Cocaine, C. Idiotocaine, D. Bupivacaine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. cocaine All local anaesthetic cause vasodilation except for cocaine which causes vasoconstriction.", 'role': 'assistant'}]