This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'To call it as fast breathing in a child of 6 months of age, the respiratory rate should be more than \nSelect and explain. \nA. 30, B. 40, C. 50, D. 60', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Fast breathing :- * 60 per min or more in a child less than 2 months of age * 50 per min or more in a child aged 2 months to 12 months * 40 per min or more in a child aged 12 months up to 5 years Ref:- K Park, 24th ed; pg num:- 180', 'role': 'assistant'}]