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
3 year old child come in ER with H/o vomiting, loose watey motion for 3 days. on examination, child was drowsy, sunken eye. Hypothermia and skin pinch take time to reve back, diagnosis? 
Select and explain. 
A. No dehydration, B. Mild dehydration, C. Some dehydration, D. Severe dehydration
D: Severe dehydration
Answer: D: Severe dehydration 
Explanation: Ans. is 'd' i.e., Severe dehydration 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 pinch. A child with some signs of dehydration will have two of the following : restlessness or irritability, sunken eyes, drinking eagerly or slow skin pinch. A child with either one or none of these signs is classified as having no signs of dehydration.