This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and physiology of bone and fracture healing, Subject name: Orthopaedics
Blue sclera is seen in all except 
Select and explain. 
A. keratoconus, B. Marfans syndrome, C. Osteogenesis impercta, D. Ehler Danlos syndrome
A: keratoconus
Answer: A: keratoconus 
Explanation: In keratoconus, there are no scleral changes. Blue sclerae are characteristic of connective tissue disorders like osteogenesis imperfecta, Marfan's syndrome, Ehlers-Danlos syndrome. Ref: Maheshwari 6e pg 316.