This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'Iron is actively absorbed in \nSelect and explain. \nA. Stomach, B. Duodenum and proximal jejunum, C. Large intestine, D. Ileum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Active absorption of iron occurs in duodenum & proximal jejunum. In stomach absorption of alcohol (20%) & drugs like aspirin takes place. In large intestine, absorption of acids and bases, water, remainder of sodium (Na) and potassium (K) i.e. remaining because not already absorbed in the small intestine takes place. The function of ileum is mainly to absorb VitaminB12 & bile salts. Ref: Guyton,11e', 'role': 'assistant'}]