**Core Concept**
Teratogenic viruses are those that can cause congenital abnormalities or birth defects when a pregnant woman is infected. These viruses can affect fetal development, leading to various physical and developmental issues. The risk of teratogenicity varies among different viruses.

**Why the Correct Answer is Right**
Measles virus is not typically considered a teratogenic virus. While measles can cause severe illness in pregnant women, the risk of congenital abnormalities is relatively low. This is because the measles virus does not directly infect the fetus in the same way that other viruses, such as rubella or cytomegalovirus, do. However, measles can lead to premature birth, low birth weight, and other complications.

**Why Each Wrong Option is Incorrect**
**Option A:** Rubella virus is a well-known teratogenic virus, causing congenital rubella syndrome (CRS) when a pregnant woman is infected during the first trimester. CRS can lead to a range of birth defects, including heart defects, hearing loss, and vision problems.
**Option B:** Cytomegalovirus (CMV) is another teratogenic virus that can cause congenital CMV infection, leading to birth defects such as hearing loss, vision impairment, and developmental delays.
**Option C:** Herpes simplex virus can cause congenital herpes, a rare but serious condition that can lead to birth defects and neurological problems.

**Clinical Pearl / High-Yield Fact**
Remember that the risk of teratogenicity varies among different viruses, and some viruses may have a higher risk than others. It's essential to consider the timing of infection, the severity of the illness, and the specific virus involved when assessing the risk of congenital abnormalities.

**✓ Correct Answer: D. Measles**