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
[{'content': 'Higher hematocrit in venous blood than in arterial blood is due to \nSelect and explain. \nA. High chloride in RBC, B. High Na+ in plasma, C. High HCO3- in plasma, D. High K+ in RBC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In venous blood, Cl- moves into RBC which results in fluid shift into RBC. This results in higher hematocrit.', 'role': 'assistant'}]