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: 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: Excessive ventilation drives out CO2 from the body causing respiratory alkalosis.
Primary hyperaldosteronisni and pyloric stenosis cause metabolic alkalosis
Diabetic ketoacidosis causes metabolic acidosis
Consider the equation