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
A 15-year-old-boy suffers from vesiculating painful ulcers, there is also oral temperature of 103° F since 3 days and lymphadenopathy. The most likely diagnosis is: 
Select and explain. 
A. Herpes zoster, B. Acute herpetic gingivostomatitis, C. Major apthae, D. Recurrent aphthae
B: Acute herpetic gingivostomatitis
Answer: B: Acute herpetic gingivostomatitis 
Explanation: None