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
Which anesthetic induction agent produces cardiac stability. In other words cardiostable anesthesia is. 
Select and explain. 
A. Ketamine, B. Propofol, C. Thiopental, D. Etomidate
D: Etomidate
Answer: D: Etomidate 
Explanation: D. i.e. Etomidate