Multiple Choice
This figure shows a CT scan where the lung on the left is severely impacted by emphysema. 
The region indicated by the arrow is clear because
A) a tumor has formed in this region.
B) tar from cigarette smoking is blocking the penetration of X-rays through the lung.
C) the alveoli in this region have all ruptured as a result of exposure to the irritants from cigarette smoke.
D) fluid has accumulated in this region of the lung as a result of edema.
Correct Answer:
Verified
Correct Answer:
Verified
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