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': 'Cardiac output is increased by all except \nSelect and explain. \nA. Exercise, B. Pregnancy, C. Hot atmosphere, D. Standing from lying down', 'role': 'user'}, {'content': "Answer: D \nExplanation: Standing from lying down because of pooling of blood in lower limb decrease in cardiac o/p by 20-30%Increasing factorsAnxiety and excitement (50-100%)Eating (30%)Exercise (up to 700%)High environmental temperaturePregnancyEpinephrine 2. Decreasing factorsSitting or standing from lying position (20-30%)Rapid arrhythmiasHea diseaseRef: Ganong's Review of Medical Physiology Twenty-Third Edition pg No:514", 'role': 'assistant'}]