Due to which of the following the disease Measles occur ?

Options

A. Bacteria
B. Virus
C. Parasite
D. Helminthens

Explanation

To determine the cause of the disease Measles, follow these steps:

### Step 1: Identify the options provided
The options given are:
1. Bacteria
2. Virus
3. Parasite
4. Helminth

### Step 2: Understand the nature of Measles
Measles is known to be a contagious disease. It is important to recognize that contagious diseases are often caused by specific types of pathogens.

### Step 3: Analyze the options
- **Bacteria**: These are single-celled organisms that can cause various diseases, but Measles is not one of them.
- **Virus**: Viruses are smaller than bacteria and require a host to replicate. Measles is known to be caused by a virus.
- **Parasite**: These organisms live on or in a host and can cause diseases, but they do not cause Measles.
- **Helminth**: These are parasitic worms and are not responsible for Measles.

### Step 4: Conclusion
Based on the analysis, the causative organism for Measles is a virus. Therefore, the correct answer is option number 2, Virus.