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
Most sensitive investigation of early bone infection 
Select and explain. 
A. X-ray, B. CT sCan, C. Bone scan, D. USG
C: Bone scan
Answer: C: Bone scan 
Explanation: Bone scan is very sensitive and is positive for changes appear on x-ray Refer Maheshwari 6th/e p 168