A patient with salicylic acid poisoning has the following arterial blood gas analysis report: pH = 7.12; PCO2 = 18 mmHg; HCO3 = 12 mmol/L. The resulting acid-base abnormality can be best labeled as:
Metabolic acidosis with respiratory alkalosis Metabolic acidosis with respiratory acidosis Respiratory acidosis with metabolic alkalosis Metabolic acidosis