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: Medicine
[{'content': 'Most common form of shock is: March 2005 \nSelect and explain. \nA. Hypovolemic shock, B. Cardiogenic shock, C. Neurogenic shock, D. Septicemic shock', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Hypovolemic shock Hypovolemic shock: Mild-Reduction in blood volume is less than 20% Moderate- Reduction in blood volume is between 20-40% Severe- Reduction in blood volume is more than 40% Physiological characteristics are: Raised systemic vascular resistance Reduced CVP, PCWP, cardiac output and venous oxygen saturation', 'role': 'assistant'}]