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: Radiology
Best investigation in acute cholecystitis is: 
Select and explain. 
A. Technetium scan, B. HIDA scan, C. Pipida scan, D. Plain X-ray abdomen
B: HIDA scan
Answer: B: HIDA scan 
Explanation: Ans. HIDA scan