48 year old male reported with the chief complaint of ulcer on the gums and on general examination headache, fever and malaise was observed. On oral examination, sharply punched out crater-like erosions of the interdental papillae of sudden onset were noted. The patient also complained of bad breath.

Diagnosis is: (A) ANUG, (B) Pericoronitis, (C) Chediak Higashi diseases, (D) Desquamative gingivitis
Answer is A. None