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: Surgery
Which among the following is main component of intracellular fluid? 
Select and explain. 
A. Sodium, B. Chloride, C. Magnesium, D. Bicarbonate
C: Magnesium
Answer: C: Magnesium 
Explanation: Cations like Potassium and Magnesium, Anions like phosphate and sulfate are main component of intracellular fluid.