This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vesiculobullous & Erosive Diseases in the Newborn and Infant, Subject name: Skin
Which of the following is a sub-epidermal blistering disorder? 
Select and explain. 
A. Pemphigus vulgaris, B. Bullous pemphigoid, C. Pemphigus foliaceous, D. Darier's disease
B: Bullous pemphigoid
Answer: B: Bullous pemphigoid 
Explanation: ANSWER: (B) Bullous pemphigoidREF: Rooks dermatology 7th ed p. 41.3-41.19Interapidermal bullaBlister at dermoepidermal junctionGranular layerJunctionalPemphigus foliaceousJunctional EBSubcorneal pustular dermatosisBullous pemphigoidStaphylococcal scalded skin syndrome Bullous impetigoDermolyticSpinous layerEpidermolytic bullosa dystrophicansFamilial benign pemphigusEpidermolytic bullosa aquisticaSuprabasalDermatitis herpetiformisPemphigus vulgarisDarier's diseaseBasal layerErythema multiformeLupus erythematosusLichen planusEBS