This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TB of the Spine, Subject name: Orthopaedics
[{'content': 'A 35-year-old lady with chronic backache. On X-ray she had a D12 collapse. But intervertebral disk space is maintained. All are possible except: \nSelect and explain. \nA. Multiple myeloma, B. Osteoporosis, C. Metastasis, D. Tuberculosis', 'role': 'user'}, {'content': "Answer: D \nExplanation: (d)- Characteristic radiological feature of Pott's spine is obliteration of disk space with destruction of two adjacent vertebrae.- This feature differentiate TB spine from other diseases causing vertebral destruction (like metastasis) in which disk space is preserved.", 'role': 'assistant'}]