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': 'MAC stands for – \nSelect and explain. \nA. Minimum alveolar concentration, B. Minimal analgesic concentration, C. Minimal anaesthetic concentration, D. Maximum alveolar concentration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]