This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following is not a cause of metabolic alkalosis? 
Select and explain. 
A. Vomiting, B. Fever, C. Renal failure, D. Both 2 & 3
D: Both 2 & 3
Answer: D: Both 2 & 3 
Explanation: 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