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
[{'content': 'Index of potency of general anaesthesia \nSelect and explain. \nA. Minimum alveolar concentration, B. Diffusion coefficient, C. Dead space concentration, D. Alveolar blood concentration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Minimum alveolar concentration', 'role': 'assistant'}]