(C) In $Pneumonia$,the alveoli of the lungs get filled with fluid,which severely reduces the respiratory surface area for gas exchange.This leads to a

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(C) In $Pneumonia$,the alveoli of the lungs get filled with fluid,which severely reduces the respiratory surface area for gas exchange.This leads to a decrease in oxygen levels in the blood (hypoxia).As a result,the fingernails and lips of patients may turn from a normal color to a greyish or bluish color due to the lack of oxygenated hemoglobin.