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. About 90% of carbon dioxide `(CO_(2))` is carried by haemoglobin as carbamino haemoglobin
C. Cigarette smoking may lead to inflammation of bronchi
D. Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration
