Which of the following is an incorrect match?

The correct answer is Option (4) → None of these

Intra Uterine Devices (IUDs) are put into the uterus through the vagina by doctors or expert nurses. They are of three kinds: non-medicated IUDs, copper releasing IUDs and hormone releasing IUDs. The question asks which pairing is wrong.

Option (1) Hormone releasing IUDs - LNG-20, Progestasert — A correct match. Progestasert and LNG-20 are hormone releasing IUDs. Besides the general action of IUDs, they make the uterus unsuitable for implantation and the cervix hostile to the sperms.

Option (2) Copper releasing IUDs - Cu7, Multiload 375 — A correct match. Cu7 and Multiload 375 (along with CuT) are copper releasing IUDs. The copper ions they release suppress sperm motility and the fertilising capacity of sperms.

Option (3) Non-medicated IUDs - Lippes loop — A correct match. Lippes loop releases neither copper nor hormones, so it is a non-medicated IUD.

All three pairs are correct, so none of them is an incorrect match.

NCERT Extract:
Population Stabilisation and Birth Control – “… Another effective and popular method is the use of Intra Uterine Devices (IUDs). These devices are inserted by doctors or expert nurses in the uterus through vagina. 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) ….”