Which one of the following is the correct statement for respiration in humnas?

Options

A. Cigarette smoking may lead to inflammation of bronchi
B. Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration
C. Workers in paper making industries may suffer from lung fibrosis
D. About 90% of carbon dioxide `(CO_2)` is carried by hemoglobin as carbamino hemoglobin

Answer

A