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
Row of tombstone is seen in which skin disorder: 
Select and explain. 
A. Pemphigus vulgaris, B. Pemphigus foliaceous, C. Paraneoplastic pemphigus, D. Bullous pemphigoid
A: Pemphigus vulgaris
Answer: A: Pemphigus vulgaris 
Explanation: Ans. A. Pemphigus vulgaris* Pemphigus vulgaris is characterized by following signs:1. Bulla spread sign2. Perilesional, and distant Nikolsky sign3. Tzanck smear: Acantholytic cell* Histopathology shows suprabasal blister with row of tomb stone appearance of basal cells.* Direct immunofluorescence from perilesional skin demonstrated intra epidermal IgG deposits' in a fishnet pattern.