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: Unknown
[{'content': 'Osteogenesis imperfect is due to a defect in: \nSelect and explain. \nA. Collagen 1, B. Collagen 2, C. Collagen 3, D. Collagen 4', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: Robbins Pathologic Basis of Disease, 8thedition, pg no: 1211-1213)\nMajor Types of Collagen in Body', 'role': 'assistant'}]