This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'Motilin is secreted by cells in \nSelect and explain. \nA. Stomach, B. Duodenum/ileum, C. Pancreas, D. Liver', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Motilin is a hormone released from endocrine cells within the epithelium of small intestine. Ref: Guyton,11e', 'role': 'assistant'}]