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
Comet Tail aefacts On USG Liver is characteristic of- 
Select and explain. 
A. Gall Bladder Polyp, B. Gall Bladder Carcinoma, C. Gall Bladder Adenomyomatosis, D. Cholelithiasis
C: Gall Bladder Adenomyomatosis
Answer: C: Gall Bladder Adenomyomatosis 
Explanation: * Adenomyomatosis of the gallbladder is a hyperplastic cholecystosis of the gallbladder wall. It is a relatively common and benign cause of diffuse or focal gallbladder wall thickening, most easily seen on ultrasound and MRI. Comet Tail aifacts On USG Liver is characteristic of Gall Bladder Adenomyomatosis. Figure 1: Comet tail aefact in GB Adenomyomatosis Figure 2: Actual Comet tail in the sky during night time (for understanding purpose)