Which virus is primarily responsible for causing Hepatitis B?

The Hepatitis B virus is the correct answer because it is the specific virus that directly causes Hepatitis B, a serious liver infection. This virus is a member of the hepadnavirus family and is primarily transmitted through contact with infectious body fluids, such as blood and semen. Hepatitis B can lead to chronic liver disease, cirrhosis, and liver cancer, making understanding its transmission and prevention crucial for direct care workers.

In contrast, the other options refer to different viruses that do not cause Hepatitis B. Human Immunodeficiency Virus (HIV) is well-known for leading to AIDS, whereas Cytomegalovirus (CMV) can cause complications primarily in immunocompromised individuals but is unrelated to hepatitis types. Hepatitis A virus causes a different liver infection that is usually not chronic, as it is primarily transmitted through contaminated food and water. Hence, it is essential to recognize the unique role of the Hepatitis B virus in the context of liver health and disease.