This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Which of the following is false regarding neoplastic compressive myelopathy? \nSelect and explain. \nA. Most neoplasms are subdural in origin, B. Thoracic spine is most commonly involved, C. Tumor does not cross the disk space to involve adjacent veebral body, D. Prognosis is poor when motor deficits are established for > 48 hours', 'role': 'user'}, {'content': "Answer: A \nExplanation: Any malignant tumour can metastasise to spinal columns, paicularly tumours of breast, lung, prostate, kidney, lymphoma and myeloma. The most common site is the thoracic spinal column. Most neoplasms are epidural in origin, resulting from metastases to adjacent veebral body. Unlike infections of the spinal column, the tumours do not cross the disk space. Reference: Harrison's Principles of Internal Medicine, 21st edition, p2653", 'role': 'assistant'}]