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 of the following anaesthetic is safe in heart failure – 
Select and explain. 
A. Etomidate, B. Propofol, C. Thiopentone, D. Ketamine
A: Etomidate
Answer: A: Etomidate 
Explanation: None