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': 'Site of action of ketamine is – \nSelect and explain. \nA. Spinal cord, B. Local nerve fibers, C. Primary action on thalamoneocortical projection, D. Posterior column', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The primary site of CNS action of ketamine seems to be the thalamocortical projection system.', 'role': 'assistant'}]