<prompt> Epidermolysis bullosa is due to defect in collagen type?Type 1Type 3Type 4Type 7  <response>: Ans. D. Type 7Diseases Caused by Mutations in Collagen Genes or by Deficiencies in the Activities of Posttranslational Enzymes Involved in the Biosynthesis of CollagenGene or EnzymeDisease 1COL1A1, COL1A2Osteogenesis imperfecta, type 12 OMIM 166200Osteoporosis 3 OMIM 166710Ehlers-Danlos syndrome type VII autosomal dominant OMIM 130060COL2A1Severe chondrodysplasias Osteoarthritis 3 OMIM 165720COL3A1Ehlers-Danlos syndrome type IV OMIM 130050COL4A3-COL4A6Alport syndrome including both autosomal and X-linked forms OMIM 104200COL7A1Epidermolysis bullosa, dystrophic OMIM 131750COL10A1Schmid metaphysial chondrodysplasia OMIM 156500Lysyl hydroxylaseEhlers-Danlos syndrome type VI OMIM 225400Procollagen N-proteinaseEhlers-Danlos syndrome type VII autosomal recessive OMIM 225410Lysyl hydroxylaseMenkes disease 4 OMIM 309400 