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 2, Subject name: Physiology
Following data was obtained from a 20 year old medical student: tidal volume = 540 mL, paial pressures of CO2 in expired air & aerial blood ~ PECO2 = 20 mm Hg, PACO2 = 30 mm Hg: respiratory rate = 15/min. The alveolar ventilation would be:- 
Select and explain. 
A. 4.2 L/min, B. 4.8 L/min, C. 5.2 L/min, D. 5.4 L/min
D: 5.4 L/min
Answer: D: 5.4 L/min 
Explanation: Alveolar ventilation = (tidal volume - dead space volume) x Respiratory rate= (540 - 180) 115 = 5.4 L/min