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: Pathology
[{'content': 'The commonest type of spinal T. B. is - \nSelect and explain. \nA. Posterior, B. Paradiscal, C. Pedicle, D. Anterior', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The commonest type of spinal T.B. is paradiscal.\nIn this contiguous areas of 2 adjacent vertebrae along with intervening disc are affected.\nThis special pattern of involvement is seen because of the embryology of the vertebra.\nThe lower half of one vertebra and upper half of the one below it, along with the intervening disc develop from pair of sclerotomes and have a common blood supply.', 'role': 'assistant'}]