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': 'In spinal tuberculosis, the commoner route of spread is: September 2010 \nSelect and explain. \nA. Direct spread, B. Blood, C. Lymphatics, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Blood', 'role': 'assistant'}]