This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anaesthesia, Subject name: Anaesthesia
Highest MAC is of Which inhalational agent- 
Select and explain. 
A. Xenon, B. Halothane, C. Sevoflurane, D. Isoflurane
A: Xenon
Answer: A: Xenon 
Explanation: Minimum alveolar concentration is defined as the alveolar concentration of an inhaled anesthetic agent that prevents movement in 50% of patients in response to a standardized surgical stimulus. Low MAC - High potency MAC values of adult Halothane: 0.75 Sevoflurane: 2.0 Isoflurane: 1.2 Desflurane: 6.0 Enflurane: 1.7 Xenon: 70 N2O: 104