This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen & Pelvis, Subject name: Anatomy
[{'content': "Peyer's patches are present in: \nSelect and explain. \nA. Duodenum, B. Jejunum, C. Ileum, D. Colon", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C. IleumPeyer's patches are small masses of lymphatic tissue found throughout the ileum region of the small intestine. Also known as aggregated lymphoid nodules, they form an important part of the immune system by monitoring intestinal bacteria populations and preventing the growth of pathogenic bacteria in the intestines.", 'role': 'assistant'}]