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
Collagen affected in Osteogenesis imperfecta - 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
A: Type I
Answer: A: Type I 
Explanation: Answer- A. Type IOsteogenesis imperfecta also known as brittle bone disease, or 'Lobstein syndrome" is a congenital bone disorder.People with OI are born with defective connective tissue, or without the ability to make it, usually because of a deficiency of Type-I collagen.