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
Severe hypovolemic shock occurs when blood volume less is - 
Select and explain. 
A. > 10 %, B. > 20 %, C. > 30 %, D. >40%
D: >40%
Answer: D: >40% 
Explanation: Hypovolemic shock

Hypovolemic shock is the most common form of shock.



This is due to a decrease in blood volume either by the loss of blood or plasma.
Grading of hypovolemic shock


Mild hypovolemia → When volume loss is less than 20%. There is generally mild tachycardia but relatively few external signs.
Moderate hypovolemia → When volume loss is between 20-40%. Normal blood pressure is maintained
	in the supine position, but there are postural hypotension and tachycardia on erect posture.
Severe hypovolemia → When volume loss is > 40%. The classical signs of shock appear i.e., marked tachycardia, hypotension, disorientation.