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: Pediatrics
[{'content': 'The newborn heart rate is about – \nSelect and explain. \nA. 120 – 160/min, B. 160 – 180/min, C. 180 – 200/min, D. 200 – 220/min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]