Which one of the following is the correct statement for respiration in humans? (A) Workers in gr...

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Which one of the following is the correct statement for respiration in humans?
(A) Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
(B) A bout \( 90 \% \) of carbon dioxide \( \left(\mathrm{CO}_{2}\right) \) is carried by haemoglobin as carbaminohaemoglobin.
(C) Cigarette smoking may lead to inflammation of bronchi.
(D) Neural signals from pneumotaxic centrein pons region of brain can increase the duration of inspiration.
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