This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'Iron is absorbed in \nSelect and explain. \nA. Stomach, B. Duodenum, C. Jejunum and ileum, D. Colon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: You should know the site of absorption of the following:', 'role': 'assistant'}]