Which of the follow ing hepatitis viruses is a DNA virus –
**Core Concept**
The question requires knowledge of the hepatitis viruses, specifically their classification as DNA or RNA viruses. Hepatitis viruses are classified into two main groups: DNA viruses and RNA viruses. The correct answer will identify the hepatitis virus that belongs to the DNA group.
**Why the Correct Answer is Right**
The correct answer is **Cytomegalovirus (CMV)**, but it's not present in the options, however, the correct answer is actually **D. Hepatitis B virus (HBV)**. HBV is a DNA virus that causes hepatitis B, a type of liver inflammation. The virus has a double-stranded DNA genome that replicates in the host cell's nucleus. HBV is transmitted through bodily fluids, such as blood and semen, and can lead to chronic liver disease, liver cancer, and other complications.
**Why Each Wrong Option is Incorrect**
* **Option A:** Hepatitis A virus (HAV) is an RNA virus, not a DNA virus. It is primarily spread through the fecal-oral route and causes acute hepatitis.
* **Option B:** Hepatitis C virus (HCV) is an RNA virus, not a DNA virus. It is transmitted through blood and can cause chronic liver disease and liver cancer.
* **Option D:** This option is missing, however the correct answer is actually **D. Hepatitis B virus (HBV)**.
**Clinical Pearl / High-Yield Fact**
It's essential to note that HBV is the only hepatitis virus that can be transmitted vertically from mother to child during childbirth. This is why HBV vaccination is recommended for all newborns, especially those born to HBV-positive mothers.
**Correct Answer: D. Hepatitis B virus (HBV)**