Question

What is the primary cause of chronic bronchitis?

a.

Exposure to air pollution

b.

Bacterial infection

c.

Long-term cigarette smoking

d.

Genetic factors

Answer: (c).Long-term cigarette smoking Explanation:The primary cause of chronic bronchitis is long-term cigarette smoking, which irritates the bronchial tubes and causes them to produce excess mucus.

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Q. What is the primary cause of chronic bronchitis?

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