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: Anatomy
[{'content': 'Accessory spleen is found at all sites, except: \nSelect and explain. \nA. Hilum, B. Presacral area, C. Tail of pancreas, D. Greater omentum, Small bowel mesentery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. Presacral area', 'role': 'assistant'}]