Which of the Following is the Major Extracellular Anion

Question

Which of the following is the major extracellular anion?
A)phosphate
B)calcium
C)magnesium
D)chloride
E)potassium

Accepted Answer

Chloride is the major extracellular anion, while the others listed are either intracellular ions or not significant contributors to extracellular anions.