The laboratory finding reveals that 57 year-old patient is suffering from metabolic acidosis. What kind of metabolic acidosis is he suffering from? ABG: 7.21/32/98 100% O2 Sat on Room Air Electrolytes: Na 145 mEq/L, K 4.5 mEq/L, Cl 105 mEq/L, HCO3 25 mEq/L a. Anion-gap metabolic acidosis b. Non-Anion-gap metabolic acidosis c. Cation gap metabolic acidosis d. Non-Cation-gap metabolic acidosis