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: Unknown
[{'content': 'Maastrichat classification category 3 stands for DCD donor of: \nSelect and explain. \nA. Brought dead patient, B. Cardiac arrest during brain dead, C. Awaiting cardiac death after withdrawal of supports, D. Cardiac arrest and unsuccessful resuscitation in hospital', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref. Sabiston Textbook of Surgery. Pg. 877\n\xa0\nMAASTRICHAAT CLASSIFICATION OF NHBD\nCategory 1 : Dead on arrival at hospital\nCategory 2 : Death with unsuccessful resuscitation .\nCategory 3 : Awaiting cardiac death .\nCategory 4 : Cardiac arrest while brain dead .', 'role': 'assistant'}]