Prenatal diagnostic technique is known as:

Options

A. Implantation
B. Amniocentesis
C. Parthenogenesis
D. Biomedical termination of pregnancy

Answer

**Step-by-Step Solution:**

1. **Understanding Prenatal Diagnostic Techniques**:
- Prenatal diagnostic techniques are methods used to diagnose conditions in a developing fetus before birth.

2. **Identifying the Options**:
- The options provided are:
A. Implantation
B. Amniocentesis
C. Parthenogenesis
D. Medical termination of pregnancy

3. **Analyzing Each Option**:
- **A. Implantation**: This refers to the process where a fertilized egg (zygote) embeds itself into the uterine lining. It is not a diagnostic technique.
- **B. Amniocentesis**: This is a procedure where amniotic fluid is extracted from the amniotic sac surrounding the fetus. This fluid contains fetal cells which can be analyzed for genetic conditions and chromosomal patterns. This is indeed a prenatal diagnostic technique.
- **C. Parthenogenesis**: This is a form of asexual reproduction where an organism develops from an unfertilized egg. It is not related to prenatal diagnostics.
- **D. Medical termination of pregnancy**: This refers to the intentional termination of a pregnancy before the fetus reaches full term. It is not a diagnostic technique.

4. **Conclusion**:
- Based on the analysis, the correct answer is **B. Amniocentesis**, as it is the only option that describes a prenatal diagnostic technique.

**Final Answer**: The prenatal diagnostic technique is known as **B. Amniocentesis**.

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