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: Physiology
Calculate alveolar ventilation per minute of a patient with respiratory rate of 12/min, tidal volume is 500ml. 
Select and explain. 
A. 6 L / min, B. 4.8 L / min, C. 4.2 L / min, D. 4 L / min
C: 4.2 L / min
Answer: C: 4.2 L / min 
Explanation: Alveolar Ventilation
= (Tidal volume - Dead space) X Respiratory rate
= (500 - 150) X 12
= 350 X 12
= 4.2 L / min