This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
[{'content': 'Most sensitive investigation of early bone infection \nSelect and explain. \nA. X-ray, B. CT sCan, C. Bone scan, D. USG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bone scan is very sensitive and is positive for changes appear on x-ray Refer Maheshwari 6th/e p 168', 'role': 'assistant'}]