This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Streptococci, Subject name: Microbiology
[{'content': 'Streptococcal pneumoniae pneumonia present at - \nSelect and explain. \nA. < 5 years, B. 5 -15 years, C. 20 - 25 years, D. 30 - 40 years', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., < 5 years o Streptococcus pneumoniae is the leading cause of pneumonia, both lobar and bronchopneumoniao Pneumonia is common at the extereme of ages :Children (especially < 5 years of age)Elderly (> 60-65years)o Serotypes 6,14,18,19 and 23 are responsible for most cases of pneumonia in children, while serotypes 1,3,4,7,8 and 12 cause pneumonia in adults.", 'role': 'assistant'}]