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
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: Ans. is 'b' i.e., 5 - 15 years o Sore throat (tonsillitis) is the most common manifestation of streptococcal infection and affects 5-15 years age group.