This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vestibulobullous disorders, Subject name: Dental
In congenital dystrophic variety of epidermolysis bullosa, mutation is seen in the gene conding for 
Select and explain. 
A. Laminin 4, B. Co11agen type 7, C. Alpha 6 integerin, D. Keratin 14
B: Co11agen type 7
Answer: B: Co11agen type 7 
Explanation: Dystrophic epidermolysis bullosa - collagen type VII Epidermolysis bullosa simplex -keratin 14 Junctional epidermolysis bullosa is an inherited disease affecting laminin and collagen . page no. 287. Reference IADVL's concise textbook of dermatology