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
Osteogenesis imperfecta is due to defect in? 
Select and explain. 
A. Type I collagen, B. Type II collagen, C. Type II collagen, D. Type IV collagen
A: Type I collagen
Answer: A: Type I collagen 
Explanation: Osteogenesis imperfecta is due to qualitatively or quantitatively abnormal type I collagen.