This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Pediatrics
[{'content': 'The most sensitive Indicator of Depletion of intravascular volume in infant is \nSelect and explain. \nA. Cardiac output, B. Stroke volume, C. Hea rate, D. Blood pressure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The most sensitive indicator of depletion of intravascular volume in infant is Hea rate. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]