Which one of the following represents a group of human diseases caused by virus?

Options

A. Measles, polio, typhoid
B. Measles, typhoid, tuberculosis
C. Measles, chickenpox, hepatitis-A
D. Chickenpox, malaria, hepatitis-A

Explanation

To solve the question "Which one of the following represents a group of human diseases caused by virus?", we will analyze the options provided and identify which diseases are caused by viruses.

### Step-by-Step Solution:

1. **Identify the Diseases in Each Option**:
- We need to look at each set of diseases given in the options and identify the causative agents.

2. **Analyze Each Disease**:
- **Option A**:
- Measles: Caused by the Morbillivirus (a virus).
- Polio: Caused by the poliovirus (a virus).
- Typhoid: Caused by Salmonella typhi (a bacterium).
- **Conclusion**: Not all diseases are caused by viruses (Typhoid is not a virus).

- **Option B**:
- Tuberculosis: Caused by Mycobacterium tuberculosis (a bacterium).
- Measles: Caused by the Morbillivirus (a virus).
- Typhoid: Caused by Salmonella typhi (a bacterium).
- **Conclusion**: Not all diseases are caused by viruses (Tuberculosis and Typhoid are not viruses).

- **Option C**:
- Measles: Caused by the Morbillivirus (a virus).
- Chickenpox: Caused by varicella zoster virus (a virus).
- Hepatitis A: Caused by hepatitis A virus (a virus).
- **Conclusion**: All three diseases are caused by viruses.

- **Option D**:
- Chickenpox: Caused by varicella zoster virus (a virus).
- Malaria: Caused by Plasmodium (a parasite).
- Hepatitis A: Caused by hepatitis A virus (a virus).
- **Conclusion**: Not all diseases are caused by viruses (Malaria is caused by a parasite).

3. **Final Decision**:
- After analyzing all options, we find that **Option C** (Measles, Chickenpox, and Hepatitis A) is the only set where all diseases are caused by viruses.

### Answer:
The correct answer is **Option C**: Measles, Chickenpox, and Hepatitis A.