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: Unknown
In exhaled air, normal pCO2 pressure is: 
Select and explain. 
A. 36 mm Hg, B. 27 mm Hg, C. 40 mm Hg, D. 17 mm Hg
B: 27 mm Hg
Answer: B: 27 mm Hg 
Explanation: (Refer: Ganong’s Review of Medical Physiology, 24th edition, pg no: 635)