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: Medicine
Bile salt is mainly absorbed in 
Select and explain. 
A. Stomach, B. Duodenum, C. Jejunum, D. Ileum
D: Ileum
Answer: D: Ileum 
Explanation: Ileum - Vit B12 and Bile salts
Duodenum - Iron.