This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
[{'content': 'Apple core lesion is seen in \nSelect and explain. \nA. Diveiculosis, B. Diveiculitis, C. Ca- colon, D. Intussusception', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Radiological hallmarks of the classic colonic Apple core lesion are sho, sharply defined regions of annular colonic narrowing with overhanging margins; ulcerated mucosa; and eccentric, irregular lumen. An apple core lesion can have a number of causes, the most serious being malignant neoplasm.', 'role': 'assistant'}]