This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Hemoglobin binding protein is 
Select and explain. 
A. Haptoglobin, B. Hemopexin, C. Albumin, D. Both Option 1 & 2
D: Both Option 1 & 2
Answer: D: Both Option 1 & 2 
Explanation: Hemopexin- Binds to porphyrins, paicularly heme for heme recyclingHaptoglobin Binding, transpo of cell-free hemoglobin (Hemoglobin 1:1 binding)