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.

This infection is reported to have an increased incidence in 
Select and explain. 
A. Diabetes mellitus, B. HIV, C. Tuberculosis, D. Syphilis
B: HIV
Answer: B: HIV 
Explanation: None