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: Dental
[{'content': 'In congenital dystrophic variety of epidermolysis bullosa, mutation is seen in the gene conding for – \nSelect and explain. \nA. Laminin 4, B. Collagen type 7, C. Alpha 6 integerin, D. Keratin 14', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dystrophic epidermolysis bullosa (dermal type EB) there is defect in the enzyme collegenase and type 7 collegan.', 'role': 'assistant'}]