This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
The normal total iron binding capacity is 
Select and explain. 
A. 0.5-1 mg/Litre, B. 1.5-2.5 mg/Litre, C. 1.0-1.5 mg/Litre, D. 300-400 mg/dl
D: 300-400 mg/dl
Answer: D: 300-400 mg/dl 
Explanation: .