Expand the terms: STD, GIFT, AI and VD.

Explanation

### Step-by-Step Text Solution:

1. **Expand STD**:
- The full form of STD is **Sexually Transmitted Diseases**.
- These are infections that are primarily spread through sexual contact. They can be caused by bacteria, viruses, or parasites. Examples include HIV/AIDS, gonorrhea, syphilis, and chlamydia.

2. **Expand GIFT**:
- The full form of GIFT is **Gamete Intrafallopian Transfer**.
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