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: Surgery
[{'content': "The Mechel's diverticulum is situated within about cm from the ileocecal valve - \nSelect and explain. \nA. 25, B. 60, C. 75, D. 100", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]