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
The target antigen in dermolytic variant of epidermolysis bullosa is: 
Select and explain. 
A. Laminin 5, B. Keratin 5 and 14, C. Collagen 7, D. Kindlin-1
C: Collagen 7
Answer: C: Collagen 7 
Explanation: Epidermolysis bullosa is classified into 4 types depending on the level of cleavage: 1. Epidermolytic variant : Keratin 5 & 14 (most common antigen) 2. Lamina lucida lytic : Laminin 5 (most common antigen) 3. Dermolytic variant : Type 7 collagen (most common antigen) 4. Mixed variant : Kindlin-1 (most common antigen) Ref: Rook's Textbook of Dermatology, 8th Edition, Page 39.2.