This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pediatrics
[{'content': 'Bronchitis in children is caused by \nSelect and explain. \nA. H. influenzae, B. R.S.V, C. Myocoplasma, D. E B V', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Breathing tubes (bronchi) in the lungs. In children, the most common cause of acutebronchitis is a virus. A cough, fever, runny nose, and body aches are common symptoms. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]