A 2 year old girl previously well presents with a history of vomiting and diarrhea for 4 hours. What is the most suitable indication for IV fluid administration?

The key is A. Capillary refill time >4s. [Capillary refill time >4s is sign of severe dehydration indicating need for IV fluid administration. Features of severe dehydration: i) abnormally sleepy or lethargic ii) sunken eyes iii) drinking poorly or not at all iv) reduced skin turgr > 2 seconds v) dry tongue and mucous membrane vi) absent tears vii) oliguria viii) hypotension ix) tachycardia x) prolonged capillary refill time xi) depressed anterior frontanelle].