Cholera, chicken pox are some well-known examples of_________ diseases.

Explanation

**Step-by-Step Solution:**

1. **Identify the Diseases**: The question mentions "Cholera" and "Chicken Pox". Both of these are well-known diseases that affect humans.

2. **Classify the Diseases**: We need to determine the type of diseases these are. Cholera is caused by bacteria, while Chicken Pox is caused by a virus.

3. **Understand the Nature of Transmission**: Both diseases can be transmitted from one person to another. This means they can spread through contact or other means.

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