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: Medicine
[{'content': "Periampullary region carcinoids are characteristically seen in: \nSelect and explain. \nA. Multiple Endocrine Neoplasia 1, B. Von Hippel Lindau disease, C. Von Recklinghausen's disease, D. Cri du chat syndrome", 'role': 'user'}, {'content': "Answer: C \nExplanation: Von Recklinghausen's disease patients develop an upper GI carcinoid tumor, characteristically in the periampullary region (54%). They contain somatostatin immunocytochemically. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3060", 'role': 'assistant'}]