<prompt> Index of potency of general anesthesiaMinimum alveolar concentrationDiffusion coefficientDead space concentrationAlveolar blood concentration  <response>: Minimal alveolar concentrationIt is the lowest concentration of the anaesthetic in pulmonary alveoli needed to produce immobility in response to a painful stimulus surgical incision in 50 individualsIt is the measure of potency of inhalation Gas.Refer: Morgan and Mikhails Clinical Anaesthesiology, 5th edition, pg no. 162 - 163 