This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pediatrics
[{'content': 'Which of the following are true for Bronchiolitis in children? \nSelect and explain. \nA. Commonly seen in children between 1- 6 months of age, but can be seen upto 2 years, B. RSV is the most common causative organism, C. Disease usually occurs in winter and spring season., D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. All of the aboveBronchiolitis primarily affects young infants (1- 6 months some may be affected upto 2 years of age), clinical manifestations are initially subtle. Infants may become increasingly fussy and have difficulty feeding during the 2 to 5-day incubation period. A low-grade fever, usually less than 101.5degF, and increasing coryza and congestion usually follow the incubation period. In older children and adults, as well as in up to 60% of infants, respiratory syncytial virus (RSV) infection is generally confined to the upper airway and does not progress further. Over a period of 2-5 days, RSV infection progresses from the upper to the lower respiratory tract, and this progression leads to the development of cough, dyspnea, wheezing, and feeding difficulties.', 'role': 'assistant'}]