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 30 years old male reported with chief complaint of  constant radiating, gnawing pain that is intensified by eating spicy foods and chewing. He also reported a "metallic" foul taste and an excessive amount of "pasty"saliva. A general examination revealed fever and increased pulse rate. Intra-oral examination showed punched-out, crater like depressions at the crest of the interdental gingival papillae, covered by a gray pseudomembranous slough, in the upper anterior teeth.

The most likely infection is 
Select and explain. 
A. Necrotizing ulcerative gingivitis, B. Localized aggressive periodontitis, C. Acute herpetic gingivostomatitis, D. Desquamative gingivitis
A: Necrotizing ulcerative gingivitis
Answer: A: Necrotizing ulcerative gingivitis 
Explanation: None