This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Circulation: Cardiac Output, Venous Return, 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: Ans. is 'd' i.e., Standing from lying down Effect of various conditions on cardiac outputNo changeo Sleep o Moderate changes in environmental temperatureIncreaseo Anxiety and excitement (50-100%) o Eating (30%) o Exercise (up to 700%) o High environmental temperature o Pregnancy o EpinephrineDecreaseo Sitting or standing from lying position (20-30%) o Rapid arrhythmias o Heart disease", 'role': 'assistant'}]