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': 'Dose of lignocaine for spinal anesthesia is `)/0 of: \nSelect and explain. \nA. 5, B. 25, C. 50, D. 75', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 5%', 'role': 'assistant'}]