Pregnant women are not advised to have certain vaccinations such as MMR, chicken pox, etc., while some vaccinations such as DPT are considered to be harmless. Give reason.

Explanation

**Step-by-Step Solution:**

1. **Understanding Vaccinations**: Vaccinations are biological preparations that provide immunity to a particular disease. They can be classified into two main types: live attenuated vaccines and inactivated (or killed) vaccines.

2. **Live Attenuated Vaccines**: Some vaccines, such as MMR (Measles, Mumps, and Rubella) and chickenpox, are live attenuated vaccines. This means they contain a weakened form of the virus that can still replicate in the body but does not cause disease in healthy individuals.

3. **Risks of Live Vaccines During Pregnancy**: Pregnant women are advised against receiving live attenuated vaccines because the weakened virus can potentially harm the developing fetus. There is a risk that the live virus could cause complications or congenital defects in the unborn child.

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