Which One of the Following Principles Is Incorrect When Discussing

Which one of the following principles is incorrect when discussing the water-seal chest drainage system?

A) When the chest has been opened,a vacuum must be applied to reestablish positive pressure.
B) Water acts as a seal to prevent air from being drawn into the pleural space.
C) Air drawn into the chest cavity collapses the lung.
D) Water-seal mechanisms operate on a negative pressure principle.

Correct Answer:

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