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
Investigation of choice in obstructive jaundice is 
Select and explain. 
A. ERCP, B. USG, C. Cholecystography, D. Laproscopy
B: USG
Answer: B: USG 
Explanation: B i.e. USG