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
Which of the following condition if not treated, can lead to indifferent course? 
Select and explain. 
A. Diphtheria, B. Herpangina, C. Herpetic Gingivostomatitis, D. ANUG
D: ANUG
Answer: D: ANUG 
Explanation: None