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: Dental
The most common cause of inflammation of gingiva in
children is: 
Select and explain. 
A. Juvenile periodontitis, B. Acute herpetic gingivostomatitis, C. Diphtheria, D. Leukemia
B: Acute herpetic gingivostomatitis
Answer: B: Acute herpetic gingivostomatitis 
Explanation: None