This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
6 years old drowsy child is brought to emergency with a history of vomitings and loose motion for 3 days. On examination, he had sunken eyes, hypothermia, skin on pinching taken very long time to reve. Diagnosis is 
Select and explain. 
A. No dehydration, B. Mild dehydration, C. Some dehydration, D. Severe dehydration
D: Severe dehydration
Answer: D: Severe dehydration 
Explanation: A child with severe dehydration will have at least two of the following four signs: sensorium is abnormally sleepy or lethargic, sunken eyes, drinking poorly or not at all, and a very slow skin pinchA child with some signs of dehydration will have two of the following: restlessness or irritability, sunken eyes, drinking eagerly or slow skin pinchA child with either one or none of these signs is classified as having dehydration.(Refer: OP Ghai's Textbook of Pediatrics, 8th edition, pg no. 265)