Which of the following is not an intrauterine device ?

Options

A. Progestasert
B. Multiload-375
C. Norplant
D. Lippes loop

Explanation

To determine which of the following options is not an intrauterine device (IUD), we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: We need to look at the options provided in the question. The options are:
- A. Progesterone
- B. Multiload 375
- C. Not Plan
- D. Lipids Loop

2. **Analyze Each Option**:
- **Option A: Progesterone**: This is described as a system that combines features of IUDs and oral progesterone. It is used as an IUD because it continuously releases progesterone into the uterine cavity. Therefore, this option is an intrauterine device.

- **Option B: Multiload 375**: This is specifically mentioned as having copper wire and is designed to be an intrauterine device. It is confirmed to be an IUD, so this option is also incorrect.

- **Option C: Not Plan**: This option refers to implants that are placed subcutaneously (under the skin) to provide contraception. Since this method does not involve placement within the uterus, it is not an intrauterine device. Therefore, this is the correct answer to the question.

- **Option D: Lipids Loop**: This is described as an intrauterine device that was introduced in 1962. It is specifically designed to fit within the uterine cavity, confirming that it is indeed an IUD.

3. **Conclusion**: After analyzing all the options, we find that the correct answer is **C. Not Plan**, as it is not an intrauterine device.

### Final Answer:
**C. Not Plan**