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
Most immunogenically safe IV anaesthetic agents- 
Select and explain. 
A. Thiopentone, B. Propofol, C. Etomidate, D. Ketamine
C: Etomidate
Answer: C: Etomidate 
Explanation: 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.