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: Physiology
At the sta of inspiration, the intrapleural pressure at the base of the lungs is 
Select and explain. 
A. 1.5 mm of Hg, B. 1 mm of Hg, C. 2.5 mm of Hg, D. 6 mm of Hg
C: 2.5 mm of Hg
Answer: C: 2.5 mm of Hg 
Explanation: At the sta of inspiration intrapleural pressure of the lung is 2.5 mm HG Ref: guyton and hall textbook of medical physiology 12 edition page number:316,317,318