This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiopulmonary Cerebral Resuscitation, Subject name: Anaesthesia
[{'content': 'In managing cardiac arrest patient the sequence from A-B-C to C-A-B was changed in which year- \nSelect and explain. \nA. 2005, B. 2010, C. 2000, D. 2016', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This was changed because there is enough oxygen in the blood to supply the hea and the brain for several minutes following cardiac arrest chest compression are needed to circulate this oxygen.', 'role': 'assistant'}]