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': 'Most immunogenically safe IV anaesthetic agents- \nSelect and explain. \nA. Thiopentone, B. Propofol, C. Etomidate, D. Ketamine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: With exception to etomidate, all IV induction agents have been alleged to cause some histamine. However, the incidence of sense anaphylaxis requiescent is extremely rare to currently available IV agents.', 'role': 'assistant'}]