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: Radiology
[{'content': 'Trifoliate appearance is in – \nSelect and explain. \nA. Peptic ulcer, B. Pyloric stenosis, C. Carcinoma head of pancreas, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: The appearance of 'trifoliate duodenum' is due to secondary duodenal diverticula which occurs as a result of scarring of peptic ulcer.", 'role': 'assistant'}]