Which of the following gas is used in anesthesia?

In the practice of medicine (especially surgery and dentistry), anesthesia or anaesthesia is a state of temporary induced loss of sensation or awareness. Desflurane, isoflurane and sevoflurane are the most widely used volatile anaesthetics today. They are often combined with nitrous oxide. Older, less popular, volatile anaesthetics, include halothane,enflurane, and methoxyflurane. Researchers are also actively exploring the use of xenon as an anaesthetic. Hence, option A is correct.