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: Pathology
[{'content': "Which of the following is the best morphological feature to distinguish ulcerative colitis from crohn's disease ? \nSelect and explain. \nA. Pseudopolyps, B. Crypt abscesses, C. Lymphoid aggregates, D. Mucosal edema", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pseudopolyps are hallmark of ulcerative colitis and is the best morphological feature to\xa0distinguish between the two.', 'role': 'assistant'}]