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
[{'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: B i.e. Duodenum and proximal jejunumAlmost all iron absorption occurs in duodenum and upper jejunum (proximal small intestine)Q.Most of the iron in diet is in ferric form (Fe3+) but it is ferrous (Fe+2) that is absorbedQ. Transpo of Fe 2+ into enterocyte occurs DMT1.', 'role': 'assistant'}]