This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Choledochal cyst \nSelect and explain. \nA. Mostly present in adulthood, B. Excision is infrequently done, C. Presents as slowly progressive jaundice, D. Can lead to carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Carcinoma in Choledochal cyst More than half tumors occur within the cyst itself(intracystic) and may recur after cyst excision Risk of malignancy is decreased after cyst excision, but risk persist even after cyst excision Type I and IV cysts have highest risk of cancer When present most commonly seen along posterior cyst wall If is age related Ref: Sabiston 20th edition Pgno :1511', 'role': 'assistant'}]