This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'For spinal anesthesia, lignocaine is used as \nSelect and explain. \nA. 0.5 % solution, B. 1 % solution, C. 2 % solution, D. 5% solution', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lignocaine is used as 5% (heavy) for spinal anaesthesia.', 'role': 'assistant'}]