Which of the following does inhaling agents such as coal dust cause?
a. tuberculosis
b. pneumonia
c. bronchitis
d. pulmonary fibrosis
e. pulmonary tuberculosis

d.pulmonary fibrosis

Pulmonary fibrosis affects the respiratory system especially the circulation and gas exchange. Hence, Pulmonary circulation is the movement of blood starting from the heart, where deoxygenated, or carbon dioxide-filled, blood leaves from the right ventricle and through the pulmonary valve, then into the left and right pulmonary arteries and arrives at the lungs. During the process of respiration, the carbon dioxide is released and oxygen is added to the blood. 

Ithink its c hope it : )