This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Totting fence post appearance of femur is seen in: \nSelect and explain. \nA. Fibrous dysplasia, B. Hyper parathyroidism, C. Pagets disease, D. Fracture neck of femur', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: B (Hyperparathyroidism) Ref: Harrison's Principles of Internal Medicine, 18th ed. and Internet Source Explanation: Renal Osteodystrophy CRF leading on to hyperparathyroidism Signs of chronic renal failure Findings of osteomalacia Hyperparathyroidism Bone sclerosis Rugger jersey spine Totting fence post appearance: Due to Rickets + Hyperparathyroidism In children, metaphyseal changes resembling rickets are seen, which together with cortical erosions can give rise to the so-called Totting fence-post' appearance, particularly at the femoral neck. Looser's zone", 'role': 'assistant'}]