The correct answer is C. bronchitis.
Bronchitis is a condition that affects the airways, which are the tubes that carry air in and out of the lungs. When the airways become inflamed, they can swell and produce mucus. This can make it difficult to breathe.
Air pollution can aggravate bronchitis by making the airways more sensitive to irritants. This can lead to more frequent and severe attacks of bronchitis.
Cholera is an infection of the small intestine caused by the bacterium Vibrio cholerae. It is characterized by severe diarrhea, vomiting, and dehydration.
Rheumatism is a term used to describe a group of conditions that affect the joints. It can cause pain, stiffness, and swelling in the joints.
Haemophilia is a genetic disorder that affects the blood’s ability to clot. This can lead to excessive bleeding from even minor injuries.
Air pollution can aggravate all of these conditions, but it is most closely associated with bronchitis.