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
A girl presented with symptoms of pharyngitis. Group A hemolytic pharyngitis is due to? 
Select and explain. 
A. Local infection, B. Hematogenous spread, C. Lymphatic spread, D. None of the above
A: Local infection
Answer: A: Local infection 
Explanation: Local infection is the most common cause of inflammation of pharyngeal structures or acute pharyngitis. Group A beta-hemolytic streptococcus is a common causative organism in both pharyngitis and tonsillitis. Local infection and inflammation cause lymph node enlargement, swelling, erythema, and pain.