<prompt> Least MAC is of which inhalational agentXeononHalothaneSevofluraneIsoflurane  <response>: Agent MACEtherHalothaneEnfluraneIsofluraneDesfluraneSevofluraneNitrous oxide 1.90.751.681.26.02.0105Refer: Morgan and Mikhails Clinical Anaesthesiology, 5th edition, pg no. 167-169 