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: Surgery
[{'content': 'Adenoma carcinoma sequence was prototypically observed in which carcinoma \nSelect and explain. \nA. Colon, B. Gastric, C. Salivary gland, D. Lacrimalgland', 'role': 'user'}, {'content': "Answer: A \nExplanation: Adenoma of colon has high malignant potential. Potentiality increases with size. If size of adenoma is >2cm there is 30-50% chance of developing carcinoma. If it is 1-2cm then there is 10% chance of developing carcinoma, and if it is less than 1cm then there is 1-5% chance of carcinoma. Reference : SRB's Manual of Surgery, 6th Edition, page no = 890.", 'role': 'assistant'}]