In lungs, the air is separated from the ...

In lungs, the air is separated from the venous blood through

A

Squamous epithelium `+` tunica external of bllod vessel

B

Squamouns epithelium `+` endotherlium of blood vessel

C

Transitional epithelium `+` tunica media of blood vessel

D

Columnar epithelium `+` 3 layered wall of bood vessel.

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The correct Answer is:

B

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