20 歲年輕人被診斷為急性壞死潰瘍性牙齦炎（acute necrotizing ulcerative gingivitis），無藥物過敏史，下列何者為最適當的處方給藥？
Amoxicillin 500 mg tid for 7 to 10 days
Famciclovir 500 mg bid for 5 to 10 days
Ibuprofen 400 mg qid for 7 to 10 days
Dexamethasone 6 mg qd for 5 to 10 days
