The diffusion membrane of the lungs is made up of which of the following layers?

  • A
    Squamous epithelium + Tunica externa of blood vessel
  • B
    Squamous epithelium + Endothelium of blood vessel
  • C
    Transitional epithelium + Tunica media of blood vessel
  • D
    Columnar epithelium + Three-layered wall of blood vessel

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Identify the correct option for the diffusion membrane.

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