Which one of the following is an example of Hormone releasing IUD?

The correct option is LNG 20.

Intrauterine Devices (IUDs) are effective contraceptive devices inserted into the uterus. They are broadly classified into three main types based on their mode of action and composition:

1. Non-medicated IUDs:
These increase phagocytosis of sperms within the uterus. Example: Lippes loop.

2. Copper-releasing IUDs:
These release copper ions (Cu²⁺) which suppress sperm motility and the fertilising capacity of sperms.
Examples: CuT, Cu 7, and Multiload 375.

3. Hormone-releasing IUDs:
These devices continuously release synthetic hormones (such as levonorgestrel) in low doses. The hormones make the uterus unsuitable for implantation and render the cervix hostile to sperms.
Examples: LNG-20 and Progestasert.

Therefore, among the given options, LNG 20 is a hormone-releasing IUD.