This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Which of the following parameters does not change with age? \nSelect and explain. \nA. Hematocrit, B. Creatinine Clearance, C. FEV1, D. Stress induced tachycardia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: Pal GK. Cardiac output. In: Textbook of Medical Physiology. Ahuja Publishing House. 2007Explanation:Parameters increased with AgeingBlood pressureFat proportionADHProstateParameters decreased with AgeingLung complianceGlucose toleranceGFRRenal clearanceAcid secretionColonic motilityNo change with AgeingHematocrit', 'role': 'assistant'}]