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
Which of the following is absorbed in the proximal intestine- 
Select and explain. 
A. Iron, B. Electrolytes, C. Bile salts, D. Vitamin B12
A: Iron
Answer: A: Iron 
Explanation: A i.e. Iron