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
Cardiac output decreases during: 
Select and explain. 
A. High Environmental temperature, B. Anxiety and excitement, C. Eating, D. Standing from lying position
D: Standing from lying position
Answer: D: Standing from lying position 
Explanation: D i.e. Standing from lying position