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Aerial blood gas of a 5 year old child done at sea level gives the following results: pH 7.41, Pa02100 mmHg, and PaCO2 40 mm Hg. The child is being ventilated with 80% oxygen. What is the (A-a) P02

A

570.4 mm Hg

B

520.4 mm Hg

C

470.4 mm Hg

D

420.4 mm Hg

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