This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
'Row of tombstones' appearance is seen in : 
Select and explain. 
A. Irritant dermatitis, B. Pemphigus, C. Pemphigoid, D. Harpes zoster
B: Pemphigus
Answer: B: Pemphigus 
Explanation: B. i.e. Pemphigus