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
With normal cardiac function, a10 mm Hg change in which of the following pressure would have a greatest effect on cardiac output 
Select and explain. 
A. Pressure in carotid aery, B. Pressure in the pulmonary aery, C. aoic pressure, D. Right atrial pressure
D: Right atrial pressure
Answer: D: Right atrial pressure 
Explanation: As change in the aerial BP effects venous return that effects cardiac output Ref: textbook of physiology Volume 1 AK Jain 7th edition