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: Surgery
[{'content': 'According to American society of Anaesthelogists the physical status of a patient with severe incapacitating systemic disease that is a constant threat to life may be classified as: \nSelect and explain. \nA. ASA 1, B. ASA 2, C. ASA 3, D. ASA 4', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]