This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vesiculobullous (Blistering) Disorders, Subject name: Skin
In congenital dystrophic variety of epidermolysisbullosa, mutation is seen in the gene conding for: 
Select and explain. 
A. Laminin 4, B. Collagen type 7, C. Alpha 6 integerin, D. Keratin 14
B: Collagen type 7
Answer: B: Collagen type 7 
Explanation: Ans. b. Collagen type 7Epidermolysis bullosa simplex: Keratitis 5 and 14Junctional: LamininDystrophicans: Collagen-7