An 18yr old male patient reported with chief complaint of pain and swelling in the right lower jaw and mild difficulty in opening mouth since one week. A general examination revealed fever and increased pulse rate.

Intra-oral examination showed signs of inflammation around the gingiva of partially impacted third molar tender on palpation with opposing tooth impinging. The most likely diagnosis is: (A) Necrotising ulcerative gingivitis, (B) Localised aggressive periodontitis, (C) Acute herpetic gingivostomatitis, (D) Pericoronitis
Answer is D. None