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: Dental
Intra–epidermal vesicles are seen in – a) Pemphigus vulgarisb) Carcinomatous pemphigusc) Dermatitis herpetiformisd) Congenital epidermolysis bullosae) Trauma 
Select and explain. 
A. ac, B. bd, C. ab, D. bce
C: ab
Answer: C: ab 
Explanation: Pemphigus vulgaris and carcinomatous pemphigus (Pemphigus foliaceous) cause intraepidermal bullae.