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: Orthopaedics
[{'content': 'A most common cause of tarsal tunnel syndrome - \nSelect and explain. \nA. Osteoarthritis, B. Ankylosing spondylitis, C. Psoriatic arthritis, D. Rheumatoid arthritis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Amongst the given options, RA is the most common cause of tarsal tunnel syndrome.\n\nFacts about etiology of tarsal tunnel syndrome\n\nMost common origin of tarsal tunnel syndrome is idiopathic (21-36%).\nWhen the cause is known, trauma is the most common cause.\nTwo most common systemic causes of tarsal tunnel syndrome are diabetes (m.c.) and RA (2nd m.c.)', 'role': 'assistant'}]