Of the following, which one is a contagious disease?
Correct answer: A. Tuberculosis
- A. Tuberculosis
- B. Lungs cancer
- C. Asthma
- D. Emphysema
Explanation
Tuberculosis is caused by Mycobacterium tuberculosis and spreads between people, especially through airborne droplets, so it is contagious. Lung cancer, asthma and emphysema are not ordinarily transmitted from one person to another. Students may choose lung cancer because it is a serious lung disease, confusing harmful disease with communicable disease.
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About Effects of Smoking
Smoking exposes the respiratory system to nicotine, tar and carbon monoxide, damaging cilia, reducing oxygen transport and narrowing or inflaming airways. The topic covers dependence, chronic bronchitis, emphysema, lung cancer and cardiovascular effects, while separating short-term physiological changes from long-term disease.
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