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: Pathology
Following is the most important factor in the management of shock: 
Select and explain. 
A. Blood pressure, B. Cardiac output, C. CVP to 8 cm of water, D. Deficiency of effective circulating blood volume
D: Deficiency of effective circulating blood volume
Answer: D: Deficiency of effective circulating blood volume 
Explanation: None