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': 'The latest AHA2010 for CPCR in basic life support by two individuals for cardiac external massage & ventilation in an adult is- \nSelect and explain. \nA. 30-2, B. 15-1, C. 15-2, D. 30-l', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: A', 'role': 'assistant'}]