This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'Highest concentration of potassium is seen in: \nSelect and explain. \nA. Jejunum, B. Ileum, C. Duodenal, D. Sigmoid colon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Sigmoid colonRef: Schwartz 10/e p69* Highest concentration of potassium seen in Colon (30mEq/L).* Highest absorption of potassium occurs in colon', 'role': 'assistant'}]