A patient presented with painful ulcerative lesions in his buccal mucosae, gingiva, and tongue. The lesions were subsequently proven to be pemphigus vulgaris on biopsy. Which of the following treatment regimens would be most effective in controlling this patient's disease?
A)Systemic acyclovir
B)Topical corticosteroids
C)Systemic corticosteroids
D)Systemic antibiotics
E)Systemic antifungals