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': 'Most common cause of pneumonia in children is? \nSelect and explain. \nA. RSV, B. Streptococcus pneumoniae, C. Staphylococcus aureus, D. Klebsiella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "Respiratory syncytial virus (RSV) is the most common cause of pediatric pneumonia"\xa0\xa0— OsIci\'s Paediatrics\n"Respiratory viruses are the single most important cause of community-aquired pneumonia in pediatric age group" — Jawetz\n\nMost common cause of pediatric pneumonia → RSV\nMost common bacterial cause of pediatric pneumonia → streptococcus pneumoniae', 'role': 'assistant'}]