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 seen in \nSelect and explain. \nA. CHPS, B. Achalasia, C. Peptic ulcer, D. Pneumoperitoneum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Trifoliate appearance is due to secondary duodenal diverticula which occurs as a result of scarring of peptic ulcer.', 'role': 'assistant'}]