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: Pathology
[{'content': 'Osteogenesis imperfecta 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: . Collagen 1', 'role': 'assistant'}]