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: Anaesthesia
[{'content': 'Vasoconstriction in blood vessels is seen with: \nSelect and explain. \nA. Cocaine, B. Lignocaine, C. Prilocaine, D. Bupivacaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cocaine', 'role': 'assistant'}]