Viruses are neither living nor dead organisms. However, they are responsible for a large number of diseases occurring in human beings. Which of the following diseases is not caused by a virus?

Options

A. Common cold
B. Chicken pox
C. Tetanus
D. AIDS

Answer

To determine which disease is not caused by a virus, we can analyze the options given in the question. Here’s a step-by-step solution:

### Step 1: Understand the nature of viruses
Viruses are unique entities that are neither classified as living nor dead. They require a host to replicate and do not possess the metabolic machinery necessary for independent life.

### Step 2: Identify diseases caused by viruses
1. **Common Cold**: Caused by rhinovirus, which is a type of virus.
2. **Chickenpox**: Caused by the varicella zoster virus, which is also viral.
3. **AIDS**: Caused by the human immunodeficiency virus (HIV), which is a viral infection.

### Step 3: Identify diseases not caused by viruses
4. **Tetanus**: This disease is caused by a bacterium known as Clostridium tetani. It is not caused by a virus but rather by a bacterial infection.

### Step 4: Conclusion
From the analysis, we can conclude that the disease that is not caused by a virus is **tetanus**.

### Final Answer
The disease that is not caused by a virus is **tetanus**.

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