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': 'In a study dye ABC is used to measure cardiac output and blood volume. The dye is replaced with a new dye XYZ which diffuses more rapidly out of the capillaries. This would affect the study by \nSelect and explain. \nA. Normal cardiac output, altered blood volume, B. Altered cardiac output, normal blood volume estimation, C. Both altered, D. Both normal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]