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
Least cardiovascular side effects found in – 
Select and explain. 
A. Isoflurane, B. Enflurane, C. Trilene, D. Ketamine
A: Isoflurane
Answer: A: Isoflurane 
Explanation: None