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 most common etiological agent for acute bronchiolitis in infancy is ? \nSelect and explain. \nA. Influenza virus, B. Para influenza virus, C. Rhinovirus, D. Respiratory syncytial virus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Respiratory syncytial virus "The most common etiological agent for Bronchiolitis is Respiratory synctial virus. RSV is responsible for more than 50% of cases of bronchiolitis." Bronchiolitis o Bronchiolitis is the most common serious acute lower respiratory tract infection in infants and young children. o Most vulnerable group is between the ages of 1 and 6 months. o But the disease can affect children up to 2 years. o More common in males. Organisms causing bronchiolitis o Bronchiolitis is predominantly a viral disease. i) RSV (most common) ii) Parainfluenza virus 3, 1, 2 v) Mycoplasma pneumoniae iii) Adenovirus iv) Influenza virus', 'role': 'assistant'}]