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': 'All are TRUE about foregut carcinoid tumors, EXCEPT: \nSelect and explain. \nA. Foregut tumors generally have a low serotonin content, B. Argentaffin-negative but argyrophilic, C. Often multi hormonal, D. Bone metastasis in not a feature', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Foregut carcinoid tumors generally have a low serotonin content. They are argentaffin-negative but argyrophilic and occasionally secrete adrenocoicotropic hormone or 5-hydroxytryptophan, causing an atypical carcinoid syndrome. They are often multi hormonal and metastasize to bone. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 3058.', 'role': 'assistant'}]