Which of the following is not a copper-releasing IUD?

The correct answer is Option (4) → LNG-20.

IUDs are of three kinds: non-medicated (Lippes loop), copper releasing (CuT, Cu7, Multiload 375) and hormone releasing (Progestasert, LNG-20). The copper ions released suppress sperm motility and the fertilising capacity of sperms.

Option (1) CuT. — Incorrect. CuT (Copper T) is a copper-releasing IUD.

Option (2) Cu7. — Incorrect. Cu7 is a copper-releasing IUD.

Option (3) Multiload 375. — Incorrect. Multiload 375 is a copper-releasing IUD.

Option (4) LNG-20. — Correct. LNG-20 is a hormone-releasing IUD, like Progestasert. It does not release copper.

NCERT Extract:
Population Stabilisation and Birth Control – “… These Intra Uterine Devices are presently available as the non-medicated IUDs (e.g., Lippes loop), copper releasing IUDs (CuT, Cu7, Multiload 375) and the hormone releasing IUDs (Progestasert, LNG-20) (Figure 3.2). IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms.”