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: Physiology
Maximum K+ concentration is seen in ___________ 
Select and explain. 
A. Saliva, B. Colon, C. Small intestine, D. Stomach
B: Colon
Answer: B: Colon 
Explanation: Maximum K+  secretion occurs in saliva.
Maximun K+ concentration occurs in colon.