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: Biochemistry
Normal serum value of magnesium ? 
Select and explain. 
A. 1.5 mEq/L, B. 5 mEq/L, C. 25 mEq/L, D. 50 mEq/L
A: 1.5 mEq/L
Answer: A: 1.5 mEq/L 
Explanation: Ans. is 'a' i.e., 1.5 mEq/L