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': 'Local anaesthetic of choice for IVRA \nSelect and explain. \nA. Bupivacaine, B. Lignocaine, C. Tetracaine, D. Procaine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lignocaine is preferred for IVRA.', 'role': 'assistant'}]