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: Forensic Medicine
[{'content': 'In a congenital dystrophic variety of epidermolysis bullosa, mutation is seen in the gene coding for? \nSelect and explain. \nA. Collagen type 7, B. Laminin 4, C. Alpha 6 integrin, D. Keratin 14', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In scarring\xa0dystrophic types,\xa0blisters developed beneath the lamina densa, in association with rudimentary or defective anchoring fibrils. Dystrophic epidermolysis bullosa is an inherited disease resulting from mutations in the COL 7A1 gene that encodes type 7 collagen', 'role': 'assistant'}]