This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bony dysplasia and soft tissue affection, Subject name: Orthopaedics
[{'content': 'Bone dysplasia is invariably seen in - \nSelect and explain. \nA. Hyperparathyroidism, B. Osteosarcoma, C. Developmental defect, D. Osteomalacia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Bone dysplasia is invariably seen in developmental disorders like dysplasias with predominantly physeal and metaphyseal changes(eg.hereditary multiple exostosis, achondroplasia), predominantly epiphyseal changes (eg.Trevor's ds, stippled epiphysis)and predominantly metaphyseal and diaphyseal changes (eg. Pyle's ds, marble bones). REF:Apley's system of ohopaedics- 9th edn- pg no158.", 'role': 'assistant'}]