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
Normal intrapleural pressure during the start of inspiration is	 ________ mm of Hg. 
Select and explain. 
A. -2, B. -5, C. 0, D. -7
A: -2
Answer: A: -2 
Explanation: None