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
Anaesthetic of choice for cardiac anaesthesia – 
Select and explain. 
A. Isoflurane, B. Ketamine, C. Methoxyflurane, D. Halothane
A: Isoflurane
Answer: A: Isoflurane 
Explanation: None