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
All are rare manifestations of carcinoid syndrome except: 
Select and explain. 
A. Retroperitoneal fibrosis, B. Peyronie's disease of the penis, C. Occlusion of the mesentric aeries, D. Steatorrhea
D: Steatorrhea
Answer: D: Steatorrhea 
Explanation: Diarrhea is present in 68-84% at some time in the disease course. Diarrhea usually occurs with flushing. Steatorrhea is present in 67%. So steatorrhea is not a rare manifestation. Rare manifestations of Carcinoid syndrome includes retroperitoneal fibrosis causing urethral obstruction, Peyronie's disease of the penis, intraabdominal fibrosis, and occlusion of the mesenteric aeries or veins. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3062