This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'All of the following causes decrease in CMRO2, CBF and ICP except:- \nSelect and explain. \nA. Thiopentone, B. Propofol, C. Ketamine, D. Etomidate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ketamine increases CMRO2, CBF and ICP because it is sympathomimetic. CBF ICP CMRO2 Seizure Thiopentone ||| ||| ||| ||| Ketamine || || | | propofol ||| ||| ||| | etomidate ||| ||| ||| |', 'role': 'assistant'}]