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': 'Maastricht classification of category 3 stands for DCD donor\nstands for \nSelect and explain. \nA. Brought dead, B. Cardiac arrest during brain dead, C. Cardiac arrest and unsuccessful resuscitation in hospital, D. Awaiting cardiac arrest after withdrawl of life support', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]