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
[{'content': 'Maximum oxygen is transpoed in blood \nSelect and explain. \nA. In dissolved form, B. By albumin, C. By hemoglobin, D. By WBC', 'role': 'user'}, {'content': "Answer: C \nExplanation: About 99% of the O2 transpoed combines with the O2carrying protein hemoglobinRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:609", 'role': 'assistant'}]