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: Pediatrics
The most sensitive indicator of depletion of intravascular volume in infant is- 
Select and explain. 
A. Cardiac output, B. Stroke volume, C. Hea rate, D. Blood pressure
C: Hea rate
Answer: C: Hea rate 
Explanation: Ans. is 'c' i.e., Hea rate o An increase in hea rate is the earliest and the most sensitive indicator to any reduction in intravascular volume.