This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 1, Subject name: Physiology
Graph given below demonstrates ventilation-perfusion ratio curve for the normal lung. If V/P ratio is decreased , what shall be the effect on pCO2 and pO2 ? 
Select and explain. 
A. | O2 tension, | CO2 tension, B. O2 tension-No change , | CO2 tension, C. |O2 tension, |CO2 tension, D. | O2 tension, | CO2 tension
D: | O2 tension, | CO2 tension
Answer: D: | O2 tension, | CO2 tension 
Explanation: Decreased ventilation-perfusion ratio-Decreased oxygenation due to decreased ventilation with respect to perfusion-PaO2 decreases and Pco2 increases.