This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Bone Disease, Subject name: Orthopaedics
[{'content': 'Osteogenesis imperfect has abnormality in which type of collagen - \nSelect and explain. \nA. Collagen 3, B. Collagen 2, C. Collagen 4, D. Collagen 1', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Collagen 1", 'role': 'assistant'}]