This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine, Subject name: Pathology
Carcinoid tumours commonly arise from: 
Select and explain. 
A. G. cells in pancreas, B. Argentaffin cells of small intestine, C. Pancreatic endocrine tumour, D. Colon polyps
B: Argentaffin cells of small intestine
Answer: B: Argentaffin cells of small intestine 
Explanation: Ans. (b) Argentaffin cells of small intestineCarcinoid tumors arise from argentaffin cells of the crypts of Lieberkuhn and are found from the distal duodenum to the ascending colon, areas embryologically derived from the midgut.