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': 'Cholangiocarcinoma histologically resembles \nSelect and explain. \nA. Squamous cell type, B. Colloid cell type, C. Schirrhous type, D. Columnar type', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It resembles schirrhous type because of fibrosis and desmoplastic reactions Based on macroscopic growth pattern cholangiocarcinoma divided into Sclerosing MC type Causes intense desmoplastic reaction Seen as diffuse thickening of the ducts without defined mass. This form is most diffucult to treat. Nodular Result in mass lesion Usually intrahepatic. Papillary Rare Low grade adenocarcinoma. Represented by polypoid mass filling the lumen of bile duct Minimal invasion and no desmoplastic reaction. More common in distal CBD. Associated with ourable outcome Ref: Sabiston 20th edition Pgno :1514-1518', 'role': 'assistant'}]