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
Normal reduced hemoglobin in blood is ? 
Select and explain. 
A. 3%, B. 10%, C. 20%, D. 30%
A: 3%
Answer: A: 3% 
Explanation: Ans. is 'a' i.e., 3%Normally 97% of hemoglobin is oxygenated.3% of hemoglobin is deoxygenated hemoglobin or reduced hemoglobin.