This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
[{'content': "Sausage finger appearance is seen in- \nSelect and explain. \nA. Psoriatic ahritis, B. Rickets, C. Hypehyroidism, D. Addison's disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Psoriatic ahritis: Involvement of IP joints (interphalangeal) Saucerization of digits Tapering of pharynges Pencil in cup deformity Telescoping sign positive Ahritis multilans / erosive ahritis Opera glass deformity (La Main en Lorgnette) Pencil Cup Deformity', 'role': 'assistant'}]