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
Highest concentration of potassium is seen in: 
Select and explain. 
A. Jejunum, B. Ileum, C. Duodenal, D. Sigmoid colon
D: Sigmoid colon
Answer: D: Sigmoid colon 
Explanation: Ans. (d) Sigmoid colonRef: Schwartz 10/e p69* Highest concentration of potassium seen in Colon (30mEq/L).* Highest absorption of potassium occurs in colon