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
Index of potency of general anaesthesia – 
Select and explain. 
A. Minimum alveolar concentration, B. Diffusion coefficient, C. Dead space concentration, D. Alveolar blood concentration
A: Minimum alveolar concentration
Answer: A: Minimum alveolar concentration 
Explanation: None