Which of the following is a method of birth control?

Options

A. GIFT
B. IVF-ET
C. IUCDs
D. HTF

Answer

To determine which of the following is a method of birth control, we need to analyze the options provided: GIFT, IVF-ET, IUCDs, and HTF.

### Step-by-Step Solution:

1. **Understanding Birth Control Methods**: Birth control methods are techniques used to prevent pregnancy. They can be categorized into several types: barrier methods, chemical methods, surgical methods, and natural methods.

2. **Analyzing the Options**:
- **GIFT (Gamete Intra-Fallopian Transfer)**: This is a technique where the ovum is transferred into the fallopian tube. It is used to facilitate pregnancy, not to prevent it.
- **IVF-ET (In Vitro Fertilization - Embryo Transfer)**: This is commonly known as the test-tube baby method. It involves fertilizing an egg outside the body and then transferring the embryo into the uterus. This method also aims to achieve pregnancy, not prevent it.
- **IUCDs (Intrauterine Contraceptive Devices)**: These are devices inserted into the uterus to prevent pregnancy. They work by altering the uterine environment to inhibit sperm motility and fertilization.
- **HTF (Human Test Fertilization)**: This term is not commonly used in the context of birth control and is often associated with assisted reproductive technologies, which aim to achieve pregnancy.

3. **Identifying the Correct Answer**: Among the options, IUCDs are specifically designed as a method of birth control. They are effective in preventing pregnancy by creating an environment that is unfavorable for sperm.

4. **Conclusion**: The correct answer is **IUCDs** (Intrauterine Contraceptive Devices), which is a method of birth control.

### Final Answer:
**IUCDs (Intrauterine Contraceptive Devices)**

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