This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculo Skeletal Disorders, Subject name: Pediatrics
Osteogenesis imperfecta with normal dentition and sclera: 
Select and explain. 
A. Type 1A, B. Type 2, C. Type 3, D. Type 4B
A: Type 1A
Answer: A: Type 1A 
Explanation: a. Type 1A(Ref: Nelson's 20/e p 3381)Osteogenesis imperfecta (OI) is the most common genetic cause of osteoporosis; OI Type I is a mild disease.Both types I & IV are divided into A and B subtypes, depending on the absence (A) or presence (B) of dentinogenesis imperfecta.