This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Lowest conc of Anaesthetic agent in pulmonary alveoli needed to produce immobility in response to painful stimulus in 50% individual is termed as: 
Select and explain. 
A. Minimal alveolar concentration, B. Maximum alveolar concentration, C. Maximum analgesic concentration, D. Minimum analgesic concentration
A: Minimal alveolar concentration
Answer: A: Minimal alveolar concentration 
Explanation: Ans. is 'a' i.e. Minimal Alveolar concentration Minimal alveolar concentration (MAC)"is the lowest concentration of the anaesthetic in pulmonary alveoli needed to produce immobility in response to a painful stimulus in 50% individuals. It is accepted as a valid measure of potency of inhalational general anesthetics" - KDT