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
Treatment of ANUG utilizes all except: 
Select and explain. 
A. Debridement, B. Oral hygiene, C. Penicillin, D. Topical steroid
D: Topical steroid
Answer: D: Topical steroid 
Explanation: None