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
Bone dysplasia is invariably seen in - 
Select and explain. 
A. Hyperparathyroidism, B. Osteosarcoma, C. Developmental defect, D. Osteomalacia
C: Developmental defect
Answer: C: Developmental defect 
Explanation: 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.