This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 2, Subject name: Physiology
[{'content': 'O2 delivery to tissues depends on all/except \nSelect and explain. \nA. Cardiac output, B. Type of fluid administered, C. Hemoglobin concentration, D. Affinity of hemoglobin for 02', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Increased cardiac output would increase the O2 transpo to the tissues. Increased Hb concentration would also increase the O2 transpo. Affinity of Hb for O2 decreases in tissues; more O2 is liberated by Hb.', 'role': 'assistant'}]