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 46-year-old, known alcoholic, presented with pain in the dorsal spine. On examination there is tendrness at the dorso-lumbar junction. Radiograph shows destruction of the 12thdorsal vertebra with loss of disc space between D12- L1 vertebrae. The most probable diagnosis is - \nSelect and explain. \nA. Metastatic spine disease, B. Pott's spine, C. Missed trauma, D. Multiple myeloma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Characteristic radiological feature of pott's spine is obliteration of disc space with destruction (wedge compression) of one or two adjacent vertebrae.\n\n\nThis feature differentiate Koch's spine from other diseases causing vertebral destruction (like metastasis, multiple myeloma), in which disc space is preserved.", 'role': 'assistant'}]