The correct option is
C Non-medicated IUDs—Lippes loop
IUDs
Intrauterine Devices (IUDs) are contraceptive devices which are inserted in the uterus.
There are three types of IUDs depending on their mechanism of action.
1) Non-medicated IUD
2) Copper releasing IUDs
3) Hormone releasing IUDs
Non-medicated IUD :
Non-medicated IUDs attract macrophages, which accumulate in the uterus and stimulate phagocytosis of sperms.
Example: Lippes loop
Copper-releasing IUD :
Copper releasing IUDs releases copper ions in the uterus where they suppress the motility of sperms, so that they cannot swim and reach the fallopian tube for fertilisation.
1) They also reduce the fertilising capacity of sperms.
2) They increase phagocytosis of sperms within the uterus.
3) Examples: Cu-T, Cu-7, Multiload 375
Hormone releasing IUD :
Hormone releasing IUDs make the cervix hostile by making the mucous thick and sticky due to which sperms will not be able to reach the uterus.
1) They also change the environment of the uterus making it unsuitable for implantation of the embryo.
2) Examples: LNG-20 and progestasert
Final answer :
(A) Non-medicated IUDs—Lippes loop