This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
Respiratory alkalosis occur in- 
Select and explain. 
A. Excessive ventilation, B. Pyloric stenosis, C. Diabetic ketoacidosis, D. Primary hyperaldosteronism
A: Excessive ventilation
Answer: A: Excessive ventilation 
Explanation: Causes of respiratory Alkalosis are: A. Central nervous system stimulation 1. Pain 2. Anxiety, psychosis 3. Fever 4. Cerebrovascular accident 5. Meningitis, encephalitis 6. Tumor 7. Trauma B. Hypoxemia or tissue hypoxia 1. High altitude 2. Pneumonia, pulmonary edema 3. Aspiration 4. Severe anemia C. Drugs or hormones 1. Pregnancy, progesterone 2. Salicylates 3. Cardiac failure D. Stimulation of chest receptors 1. Hemothorax 2. Flail chest 3. Cardiac failure 4. Pulmonary embolism E. Miscellaneous 1. Septicemia 2. Hepatic failure 3. Mechanical hyperventilation 4. Heat exposure 5. Recovery from metabolic acidosis