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: Psychiatry
[{'content': 'Most reliable test for spinal tuberculosis \nSelect and explain. \nA. Raised ESR, B. PPD skin test, C. CT guided biopsy, D. MRI', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. CT guided biopsy', 'role': 'assistant'}]