This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
[{'content': 'Net secretion of K+ occurs in the:- \nSelect and explain. \nA. Duodenum, B. Jejunum, C. Ileum, D. Colon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Small intestine Colon Reabsorption of Na+, Cl-, K+, watersecretion of HCO-3 Reabsorption of Na+, Cl-, water secretion of K+, HCO-3', 'role': 'assistant'}]