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
Cholelithiasis is paicularly seen in association with which of the following malignancy ? 
Select and explain. 
A. Somatostatinoma, B. Insulinoma, C. Glucagonoma, D. GRFoma
A: Somatostatinoma
Answer: A: Somatostatinoma 
Explanation: Somatostatinoma produces somatostatin in excess. Most common tumor location is pancreas. >70 % are malignant. Cholelithiasis is seen in 65-90%. Other manifestations are diabetes and diarrhea. Reference: Table 350-2, Harrisons Principles of Internal Medicine, 18th Edition, Page 3057