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
All of the following cause myocardial depression except – 
Select and explain. 
A. Halothane, B. Etomidate, C. Thiopentone, D. Ketamine
B: Etomidate
Answer: B: Etomidate 
Explanation: None