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: Pathology
Acute herpetic gingivostomatitis 
Select and explain. 
A. occur in children and young adults, B. occur only in young children, C. occur in only adults, D. all of the above
A: occur in children and young adults
Answer: A: occur in children and young adults 
Explanation: None