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: • Maximum K+ concentration: Colon\xa0(30 mEq/L) >Saliva (25 mEq/L)', 'role': 'assistant'}]