This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver, Subject name: Surgery
[{'content': "Solitary hypoechoic lesion of the liver without septa or debris is most likely to be:- \nSelect and explain. \nA. Hydatid cyst, B. Caroli's disease, C. Liver abscess, D. Simple cyst", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Simple hepatic cyst Contain serous fluid, do not communicate with the biliary tree, and do not have septations. Single in 50% cases. Treatment Nonsurgical treatment: Aspiration and injection of a sclerosing agent (most frequently ethanol) Complication MC complication: Intracystic bleeding', 'role': 'assistant'}]