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': 'Which of the following features is not seen ileocaecal tuberculosis? \nSelect and explain. \nA. Pulled up caecum, B. Apple core appearance, C. Obliteration of angle between ileum and caecum, D. Narrowing of distal end of caecum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Apple core appearance', 'role': 'assistant'}]