This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ULTRASOUND, Subject name: Radiology
Investigation of choice to visualize gallbladder pathologies: 
Select and explain. 
A. CT, B. USG, C. Plain X-Ray, D. MRCP
B: USG
Answer: B: USG 
Explanation: Ultrasound is the Investigation of Choice for most Gall Bladder pathologies like Acute Cholecystitis, Gb polyp, Gb calculus.