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
ANUG affects the 
Select and explain. 
A. Attached gingiva, B. Marginal gingiva, C. Alveolar mucosa, D. Inter dental papilla
D: Inter dental papilla
Answer: D: Inter dental papilla 
Explanation: None