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: Radiology
[{'content': 'Acro-osteolysis is seen in: March 2012 \nSelect and explain. \nA. Frostbite, B. Leprosy, C. Scleroderma, D. Hypoparathyroidism', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans: C i.e. Scleroderma Acro-osteolysis (resorption of the distal phalangeal tuft) is seen in hyperparathyroidism, scleroderma, raynaud's, psoriasis etc. Musculoskeletal system: Radiological signs and conditions Polka dot in veebra: Haemangioma Champagne glass pelvis: Achondroplasia Pencil thin coex: Scurvy Onion skin appearance: Ewings sarcoma Fallen fragment sign: Aneurysmal bone cyst Codman's triangle and Sunray appearance: Osteosarcoma Cotton wool/Ground glass appearance: Fibrous dysplasia Earliest radiological sign in acute osteomyelitis: Soft tissue swelling Water's view/ Occipito-mental view is done for: - Maxillary, - Ethmoid, - Sphenoid sinus Odontoid view is done to visualize: C1, C2 veebrae", 'role': 'assistant'}]