This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2018, Subject name: Surgery
[{'content': 'Which of the following is category 3 in Maastricht classification of donation after cardiac death? \nSelect and explain. \nA. Awaiting cardiac arrest, B. Brought in dead, C. Unsuccessful resuscitation, D. Cardiac arrest after brainstem death', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Maastricht Classification for Donation after Circulatory Death (DCD) Donors Category Description (DRACUIa) 1 Dead on arrival at hospital 2 Resuscitation attempted without success 3 Awaiting cardiac arrest after withdrawal of suppo (Most DCD donors from Category 3) 4 Cardiac arrest while brain dead 5 Cardiac arrest & Unsuccessful resuscitation in hospital Mn: DRACULa', 'role': 'assistant'}]