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: Microbiology
Most common age group affected by streptococcus pyogenes 
Select and explain. 
A. <5 years, B. 5-15 years, C. 20-25 years, D. 30-40 years
B: 5-15 years
Answer: B: 5-15 years 
Explanation: Sore throat(tonsilitis) is the most common manifestation of streptococcal infection and affects 5-15 years age group.