This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatobiliary radiology, Subject name: Radiology
Parallel shotgun appearance on Ultrasound is seen in 
Select and explain. 
A. Poal hypeension, B. Biliary ascariasis, C. Obstructive jaundice, D. Sclerosing cholangitis
C: Obstructive jaundice
Answer: C: Obstructive jaundice 
Explanation: Distal CBD obstruction: Common bile duct gets distended due to obstruction & gives a "Double Barrel appearance" or "Parallel Shotgun sign" on USG