This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Effect of prolonged oxygen therapy is - 
Select and explain. 
A. a) Endothelial damage, B. Increased pulmonary compliance, C. Atelectasis, D. Decreased vital capacity
C: Atelectasis
Answer: C: Atelectasis 
Explanation: More severe problems can include: Lung damage.(Atelectasis) Fluid buildup or bursting (rupture) of the middle ear. Sinus damage. Changes in vision, causing nearsightedness, or myopia. Oxygen poisoning, which can cause lung failure, fluid in the lungs, or seizures Ref Davidson 23rd edition pg 545