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
Blood buffers are: 
Select and explain. 
A. Bicarbonate, B. Plasma proteins, C. Hemoglobin, D. All
D: All
Answer: D: All 
Explanation: A i.e. Bicarbone; B i.e. Plasma Proteins; C i.e.Hemoglobin