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': 'In lobstein disease or brittle bone disease defect occurs in: \nSelect and explain. \nA. Type 1 collagen, B. Type 2 collagen., C. Type 4 collagen., D. Type 6 collagen.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Osteogenesis imperfecta is also known as lobstein disease in which defect occurs in type 1 collagen.', 'role': 'assistant'}]