This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Metabolic Bone Disease, Subject name: Radiology
[{'content': "Sausage finger appearance is seen in - \nSelect and explain. \nA. Psoriatic arthritis, B. Rickets, C. Hyperthyroidism, D. Addison's disease", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Psoriatic arthritis o The term sausage digit refers to the clinical and radiologic appearance of diffuse fusiform swelling of a digit due to soft-tissue inflammation from underlying arthritis or dactylitis.o The common causes of sausage digit are:1) Psoriatic arthropathy.2) Osteomyelitis.3) Ankylosing spondylitis4) Sickle cell disease5) Tuberculosis6) Leprosy", 'role': 'assistant'}]