Name the infectious disease which causes wasting of body parts. Give the scientific name of pathogen and mention the body organs it primarily affects.

Explanation

**Step-by-Step Solution:**

1. **Identify the Infectious Disease:**
- The infectious disease that causes wasting of body parts is **AIDS**, which stands for **Acquired Immunodeficiency Syndrome**. This condition is characterized by a significant loss of body weight and muscle mass, often referred to as wasting syndrome.

2. **Scientific Name of the Pathogen:**
- The pathogen responsible for AIDS is the **Human Immunodeficiency Virus**, commonly abbreviated as **HIV**. This virus is classified as a retrovirus.

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