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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) 8-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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