Which of the following is not a cause of metabolic alkalosis?
Causes of Respiratory Acidosis: (pH ↓, CO2 ↑)

Hypoventilation
Pulmonary edema
COPD
Airway obstruction
Neuromuscular diseases

Causes of Metabolic Acidosis: (pH ↓, HCO3 ↓)

Diabetic Ketoacidosis
Salicylate overdose
Diarrhoea
Shock
Sepsis
Renal failure

Causes of Respiratory Alkalosis: (pH ↑, CO2 ↓)

High altitudes
Pregnancy
Hypoxia
Fever

Causes of Metabolic Alkalosis: (pH ↑, HCO3 ↑)

Vomiting
Excessive ingestion of alkali
Cortisone excess
Vomiting
Fever
Renal failure
Both 2 & 3