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
A child was given Ringer's lactate due to severe blood loss by a road accident. What is the potassium content of Ringers' lactate in mEq/L? 
Select and explain. 
A. 1, B. 2, C. 4, D. 6
C: 4
Answer: C: 4 
Explanation: Composition in 1 Litre of Ringer's lactate: Sodium 130 mEq/L Potassium 4 mEq/L Calcium 3.5 mEq/L Chloride 110 mEq/L Lactate 27 mEq/L Ref: Oski's Pediatrics: Principles And Practice By Julia A. McMillan, Ralph David Feigin, 4th edition, Page 64.