Which of the following contraceptive devices makes the uterus unsuitable for implantation and the cervix hostile to the sperms ?

Options

A. Lippe's loop
B. Copper releasing IUDs
C. Hormone releasing IUDs
D. Multiload 375 IUDs

Answer

To solve the question "Which of the following contraceptive devices makes the uterus unsuitable for implantation and the cervix hostile to the sperms?", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify a contraceptive device that makes the uterus unsuitable for implantation and alters the cervix to prevent sperm from reaching the egg.

2. **Analyzing the Options**:
- **Option 1: Lipid Loop**:
- This is a non-medicated intrauterine device (IUD). It primarily prevents pregnancy by creating a physical barrier but does not significantly alter the uterine environment or cervical mucus.

- **Option 2: Copper-Releasing IUDs**:
- These IUDs release copper ions, which are toxic to sperm and reduce their motility. They do create an unfavorable environment for sperm but do not specifically make the uterus unsuitable for implantation.

- **Option 3: Hormone-Releasing IUDs**:
- These devices release hormones (such as progesterone) that thicken cervical mucus, making it difficult for sperm to enter the uterus. They also alter the uterine lining, making it less suitable for implantation.

- **Option 4: Multiload 375 IUD**:
- This is another type of copper-releasing IUD, similar to option 2, which primarily affects sperm motility but does not significantly alter the uterine environment for implantation.

3. **Conclusion**:
- The correct answer is **Option 3: Hormone-Releasing IUDs**. These devices make the uterus unsuitable for implantation and the cervix hostile to sperm.

### Final Answer:
**Hormone-Releasing IUDs**