This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder, Subject name: Surgery
[{'content': 'This incidental finding on ultrasound abdomen is suggestive of: \nSelect and explain. \nA. Gall bladder stone, B. Gall bladder polyp, C. Adenomyomatosis, D. Xanthgranulomatous cholecystitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Adenomyomatosis: Image shows: Diamond ring sign / comet tail aefact / V - shaped aefact Hyperplasia in muscularis & hyperproliferation of mucosa in gall bladder. Rokitansky-Aschoff sinuses are deep and there is deposition of Cholesterol crystal, when ultrasound is performed it looks like a ring. Rx: Symptomatic gall stone present - Lap. Cholecystectomy', 'role': 'assistant'}]