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: Surgery
[{'content': 'Action of toxic doses of LA on CNS can be described as: \nSelect and explain. \nA. Depression of the CNS, B. Stimulation of the CNS, C. First stimulating the CNS followed by depression., D. First depression it followed by CNS stimulation.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]