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: Anaesthesia
Lowest concentration of anaesthetic agent in alveoli needed to produce immobility in response to painful stimulus in 50% of individual is termed as – 
Select and explain. 
A. Minimum alveolar concentration, B. Minimal analgesic concentration, C. Minimal anaesthetic concentration, D. Maximum alveolar concentration
A: Minimum alveolar concentration
Answer: A: Minimum alveolar concentration 
Explanation: MAC is the lowest concentration of the anaesthetic in pulmonary alveoli needed to produce immobility in response to a painful stimulus (surgical incision) in 50% individuals.