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: Pathology
In which of the following disorders a circulating antibody directed to intercellular cementing substance of stratified squamous epithelium is observed: 
Select and explain. 
A. Lichen planus, B. Verrucous vulgaris, C. Bullous pemphigoid, D. Pemphigus vulgaris
D: Pemphigus vulgaris
Answer: D: Pemphigus vulgaris 
Explanation: None