This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
A 40 year old male develops excessive hyperventilation.ABG reveals pH-7.5,pCO2 24 mm Hg,PO2 88 mmHg. Diagnosis? 
Select and explain. 
A. Respiratory alkalosis, B. Metabolic alkalosis, C. Respiratory acidosis, D. Metabolic acidosis
A: Respiratory alkalosis
Answer: A: Respiratory alkalosis 
Explanation: Ref Harrison 19 th ed pg 323 There is alkalosis (pH-7.5) and CO2 is low ( alkalosis).change in CO2 is in keeping with change in pH and thus the primary cause is respiratory. The acid base disturbance is thus primary respiratory alkalosis.