This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone, Subject name: Orthopaedics
[{'content': 'All are features of Osteogenesis imperfecta except: \nSelect and explain. \nA. Blue sclera, B. Multiple, C. Cataract, D. Hearing loss', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. Cataract Osteogenesis imperfecta (firagilitas ossium):This condition is characterised by tendency for frequent fractures because of weak and brittle bones.It results from defective collagen synthesis (type I collagen. Thus also affecting other collagen containing soft tissue such as skin, sclera, teeth, ligaments etc.inheritance is AD or AR*AR is very severe form and the child is bom with multiple fractures and diesClinical features:Blue sclera* (because of thin sclera colour of underlying choroid is visible.)Joint laxity * (b/c of weak ligaments)Hearing loss (b/c of otosclerosis)*Hernias* (because of defective skin)Brittle bones* (because of abnormal synthesis of bone matrix).The fractures unite normally but deformities secondary to malunion or joint contractures may occur.Other causes of 'tendency for easy fractures':Osteoporosis*Osteopetrosis*Osteomalacia*Polio limb", 'role': 'assistant'}]