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
5 year old child with watery diarrhea for 7 days, on examination, weight = 10 kg, hanging skin folds with normal skin pinch, Sodium in ORS should be - 
Select and explain. 
A. 45 meq/Lit, B. 60 meq/Lit, C. 75 meq/Lit, D. 90 meq/Lit
C: 75 meq/Lit
Answer: C: 75 meq/Lit 
Explanation: Ans. is 'c' i.e., 75 meq/Lit