This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatric orthopedics, Subject name: Orthopaedics
[{'content': "Radiological sign in case of Pehe's disease - \nSelect and explain. \nA. Epiphyseal calcification, B. Organized calcification, C. Lateral subluxation femur head, D. Restriction of abduction", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pehes disease is divided into 5 distinct radiographic stages : *cessation of growth of capital femoral epiphysis - occurs after initial ischaemic episode & last for 6-12 months . *subchondral fracture - causes collapse of head &ischemia ,visible on radiograph for an average of three months *resorption - necrotic epiphyseal bone beneath the subchondral fracture is gradually & irregularly resorbed & takes 6-12 months *re- ossification- ossification of vascular fibrous tissue takes place .the capital femoral epiphysis regains its normal strength ,takes 6-24 months * healing or residual stage - femoral head is healed with or without residual deformity. REF:textbook of ohopaedics ,John ebnezer, 4th edition , pg.no.412', 'role': 'assistant'}]