What Is the Anion Gap Given the Following Serum Electrolyte

Multiple Choice

What is the anion gap given the following serum electrolyte data: Na = 132 mmol/L,Cl^- = 90 mmol/L,HCO₃^- = 22 mmol/L,K = 4 mmol/L?

A) 10 mmol/L
B) 18 mmol/L
C) 20 mmol/L
D) 60 mmol/L