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': 'Cardiac output decreases during \nSelect and explain. \nA. Moderate increase in environmental temperature, B. Anxiety and excitement, C. Eating, D. Standing from lying down position', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Standing from lying down positionRef: Ganong, 25th ed/p.544Cardiac output changesNo change:SleepIncreases during:Anxiety and excitement (50-100%)Eating (30%)Exercise (up to 700%)High environmental temperaturePregnancyEpinephrineDecreases during:Standing from lyingHeart diseases', 'role': 'assistant'}]