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: Medicine
[{'content': 'The majority of cases of community acquired pneumomia are due to infection with- \nSelect and explain. \nA. Legionella pneumophila, B. Streptococcus pneumoniae, C. Haemophilus influenzae, D. Staphylococcus aureus', 'role': 'user'}, {'content': "Answer: B \nExplanation: The most common infective agent of community acquired pneumonia is Streptococcus pneumoniae.Most cases are spread by droplet infection.Viral infections are impoant causes of CAP in children. Reference:Davidson's Medicine-22nd edition,page no:682", 'role': 'assistant'}]