343 - NIMSET Orthopaedics MS 2010 paper - part 2

2q: Look at the figure below:

What does line 1 and line 2 stand for respectively ?

a. airway pressure and alveolar pressure
b. airway pressure and pleural pressure
c. alveolar pressure and airway pressure
d. airway open pressure and pleural pressure

answer a. airway pressure and alveolar pressure

*The above figure is the original figure from which the question was prepared. So line 1 stands for airway pressure and line 2 stands for alveolar pressure.