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
Maximum oxygen is transpoed in blood 
Select and explain. 
A. In dissolved form, B. By albumin, C. By hemoglobin, D. By WBC
C: By hemoglobin
Answer: C: By hemoglobin 
Explanation: About 99% of the O2 transpoed combines with the O2carrying protein hemoglobinRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:609