This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Pathology
'Row of tombstones' appearance is seen in: 
Select and explain. 
A. Irritant dermatitis, B. Pemphigus, C. Pemphigoid, D. Herpes zoster
B: Pemphigus
Answer: B: Pemphigus 
Explanation: Ans. (b) Pemphigus(Ref: Robbins 9th/pg 1167)DiseaseBiopsy featuresDIFPemphigus vulgaris* Suprabasal acantholytic vesicle (tombstone pattern) Q* Mixed perivascular infiltrate with eosinophils QIgG within suprabasal intercellular spaces-fishnet pattern Q