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: Pharmacology
[{'content': 'Percentage of lignocaine used in spinal anaesthesia is : \nSelect and explain. \nA. 0.50%, B. 1%, C. 2%, D. 5%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]