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: Surgery
[{'content': 'Highest concentration of potassium is seen in ? \nSelect and explain. \nA. Jejunum, B. ileum, C. Duodenum, D. Colon', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Colon", 'role': 'assistant'}]