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: Pathology
In congenital dystrophic variety of epidermolysis bullosa, mutation is seen in the gene coding for - 
Select and explain. 
A. Laminin 4, B. Collagen type 7, C. Alpha 6 integrin, D. Keratin 14
B: Collagen type 7
Answer: B: Collagen type 7 
Explanation: . Collagen type 7