The factor(s) that could cause emphysema in humans is/areI. urban smogII. bacterial infectionIII. tobacco smoke
Correct answer: C. I and III
- A. I only
- B. II only
- C. I and III
- D. II and III
Explanation
The correct answer is I and III. Emphysema is primarily caused by long-term exposure to airborne irritants, including tobacco smoke and air pollution such as urban smog. Tobacco smoke is the leading cause, while urban smog can also contribute to lung damage over time. Bacterial infections affect the lungs but are not a cause of emphysema, hence option II is incorrect.
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