GIFT is

Options

A. Embryo implantation after in vivo fertilization
B. Sperm injection for in vivo fertilization
C. Embryo implantation after in vitro fertilization
D. Egg implantation for in vivo fertilization

Answer

To answer the question "GIFT is", we need to analyze the options provided and understand what GIFT stands for and its process.

### Step-by-Step Solution:

1. **Identify the Full Form of GIFT**:
- GIFT stands for "Gamete Intrafallopian Transfer". This is a key term that we need to remember.

2. **Understand the Process of GIFT**:
- GIFT is a technique used in reproductive health where both eggs (ova) and sperm are collected and then transferred into the fallopian tubes of a female. This process allows fertilization to occur naturally within the body.

3. **Differentiate Between In Vivo and In Vitro**:
- In vitro refers to processes that occur outside the body (e.g., in a lab), while in vivo refers to processes that occur inside the body. GIFT is an in vivo technique because the fertilization happens within the female's body.

4. **Analyze the Options**:
- Option A: "Embryo implantation after in vivo fertilization" - This is incorrect as GIFT involves gametes, not embryos.
- Option B: "Sperm injection for in vivo fertilization" - This is incorrect as GIFT involves both eggs and sperm, not just sperm injection.
- Option C: "Embryo implantation after in vitro fertilization" - This is incorrect as GIFT is not an in vitro process.
- Option D: "Egg implantation for in vivo fertilization" - This is correct because GIFT involves the transfer of both eggs and sperm into the fallopian tubes for fertilization to occur in vivo.

5. **Conclusion**:
- Based on the analysis, the correct answer is **Option D: Egg implantation for in vivo fertilization**.