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: Surgery
[{'content': 'The compression fracture is commonest in \nSelect and explain. \nA. Cervical spine, B. Upper thoracic spine, C. Lower thoracic spine, D. Lumbosacral region', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Lower thoracic spine - Aproximately 90% of all spinal fractures occur in the thoracic and lumbar spines. Infact, the majority of thoracic and lumbar injuries occur with in the region between T11 & L1, commonly referred as thoraco- lumbar junction. - Compression/ wedge fractures involves bucking , or fracture of anterior and middle aspect of veebral body (unlike burst , there is no involvement of posterior veebral body). Axial loading with a flexion movement is the mechanism of injury. - Osteoporosis is the most common cause of multiple compression fractures - Compression fractures are most common in thoracolumbar spineQ (lower dorsal > upper lumbar)Q.', 'role': 'assistant'}]