Question:
Which of the following is caused by neither bacteria nor viruses?
Which of the following is caused by neither bacteria nor viruses?
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Chronic bronchitis = Non-infectious disease, mainly due to smoking or pollution, unlike most respiratory infections.
Updated On: May 4, 2026
- Laryngitis
- Sinusitis
- Chronic bronchitis
- Pneumonia
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The Correct Option is C
Solution and Explanation
Concept:
Diseases can be caused by infectious agents (like bacteria and viruses) or by non-infectious factors such as environmental pollutants, smoking, or lifestyle-related conditions.
Step 1: Understand the nature of each disease.
• Laryngitis → Commonly caused by viral or bacterial infection
• Sinusitis → Usually caused by bacterial or viral infection
• Pneumonia → Caused by bacteria, viruses, or fungi
• Chronic bronchitis → A non-infectious disease mainly caused by smoking or long-term exposure to irritants
Step 2: Identify the non-infectious condition. Chronic bronchitis is a type of Chronic Obstructive Pulmonary Disease (COPD) and is primarily caused by environmental factors, especially smoking, not by bacteria or viruses.
Step 3: Conclusion. Thus, the condition not caused by bacteria or viruses is: \[ \text{Chronic bronchitis} \]
Diseases can be caused by infectious agents (like bacteria and viruses) or by non-infectious factors such as environmental pollutants, smoking, or lifestyle-related conditions.
Step 1: Understand the nature of each disease.
• Laryngitis → Commonly caused by viral or bacterial infection
• Sinusitis → Usually caused by bacterial or viral infection
• Pneumonia → Caused by bacteria, viruses, or fungi
• Chronic bronchitis → A non-infectious disease mainly caused by smoking or long-term exposure to irritants
Step 2: Identify the non-infectious condition. Chronic bronchitis is a type of Chronic Obstructive Pulmonary Disease (COPD) and is primarily caused by environmental factors, especially smoking, not by bacteria or viruses.
Step 3: Conclusion. Thus, the condition not caused by bacteria or viruses is: \[ \text{Chronic bronchitis} \]
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