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
Compliance of lungs is 
Select and explain. 
A. 200 ml/cm water, B. 500 ml/cm water, C. 800ml/cm water, D. 1000ml/cm water
A: 200 ml/cm water
Answer: A: 200 ml/cm water 
Explanation: The change in lung volume per unit change in airway pressure (DV/DP) is the compliance (stretchability) of the lungs and chest wall. It is normally measured in the pressure range where the relaxation pressure curve is steepest, and the normal value is approximately 0.2 L/cm H2O.Ref: Ganong review of medical physiology 23rd edition Page no: 595