Black lung disease is common among

What is correct for emphysema?

Which of the following is a bacterial disease of the respiratory system?

Assertion $A$: Pneumonia is a serious respiratory disease.
Reason $R$: The accumulation of fluid in the alveoli and bronchioles prevents sufficient oxygen from reaching the lungs.
Which option is correct for Assertion $A$ and Reason $R$?

$A$ person involved in stone masonry work is likely to suffer from . . . . . . .

Which of the following is associated with pneumonia?