This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamental Concepts, Subject name: Anaesthesia
MAC of an anesthetic agent is the measure of its? 
Select and explain. 
A. Potency, B. Speed of induction and recovery, C. Lipid solubility, D. Toxicity
A: Potency
Answer: A: Potency 
Explanation: Ans. is 'a' i.e., Potency * Minimum alveolar concentration (MAC) - Measure of potency.* Blood: Gas partition coefficient - Blood solubility of anesthetic agent and determines the speed of induction & recovery.* Oil: Gas partition coefficient - Lipid solubility of anesthetic agent and is related to potency of anesthetic agent.