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The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main `function and // or characteristic`.

A

A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air

B

B - pleural membrane - surround ribs on both sides to provide cushion against rubbing

C

C - Alveoli - thin walled vascular bag like structures for exchange of gases

D

D - Lower end of lungs - diaphragm pulls it down during inspiration

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