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
Which of the following is sign of severe Dehydration in a child 
Select and explain. 
A. Lethargy, B. Irritability, C. Increased duration of skin pinch, D. Suken eyes
A: Lethargy
Answer: A: Lethargy 
Explanation: Sunken eyes, mouth and tongue very dry , condition lethargy ,skin pinch goes back very slowly The patient has 2 / more signs there is severe dehydration Ref: Ghai pediatrics eighth edition pg no 293