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': 'Regarding ketamine all are true except \nSelect and explain. \nA. Ketamine acts on NMDA receptors in brain, B. Indirectly acting sympathomimetic agent, C. Contraindicated in shock, D. Agent of choice in asthma patients.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ketamine being sympathomimetic, is agent of choice in shock.', 'role': 'assistant'}]