This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'Which of the following has the highest potential of progression into a cancer? \nSelect and explain. \nA. Adenomatous polyp, B. Juvenile polyp, C. Hyperplastic polyp, D. Hamartomatous polyp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Adenomatous polypRef: Sabiston 20th edition, Page 1363* Highest malignant potential is villous adenoma > tubular adenomatous polyps', 'role': 'assistant'}]