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': 'A two–year child is classified as having pneumonia, if the respiratory rate is more than – \nSelect and explain. \nA. 30/min, B. 40/min, C. 50/min, D. 60/min', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]