This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vesiculobullous (Blistering) Disorders, Subject name: Skin
A middle aged female has flaccid bullae in the skin and oral erosion. Histopathology shows intraepidermalacantholoytic blisters. The most likely diagnosis is: 
Select and explain. 
A. Bullous pemphigoid, B. Paraneoplastic pemphigus, C. Dermatitis herpetiformis, D. Pemphigus vulgaris
D: Pemphigus vulgaris
Answer: D: Pemphigus vulgaris 
Explanation: Ans. d. Pemphigus vulgarisFlaccid intraepidermal bullae with oral erosions are seen in pemphigus vulgaris