3) Lippes loop
4) all of the above
Explanation: IUDs are intrauterine devices and are the most widely used contraceptives in India. LNG-20 is the hormone-releasing IUD, Lippes loop is a non-medicated IUD and CuT is the Copper-releasing IUD. They work by affecting sperm motility, fertilisation capacity and thicken cervical mucus.
LNG-20 contains levonorgestrel similar to progesterone. It thickens the cervical mucus and makes the uterus unfavourable for implantation.
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