This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Ulcerative colitis progressing to malignancy is characterized by following except - \nSelect and explain. \nA. Risk increases with the time, B. Prognosis worsens, C. Prognosis depends on period, D. Forms pseudopolyps', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]