- Periodic abstinence: Involves avoiding sexual intercourse during the fertile period of the menstrual cycle.
- Lactational amenorrhea: Refers to the natural infertility that occurs during breastfeed ing.
- Vaults: Vaults are not a natural contraceptive method; they are related to an artificial means of contraception.
- Coitus interruptus: Also known as the withdrawal method, where the man withdraws before ejaculation.
Thus, the correct answer is (3).
List I | List II | ||
---|---|---|---|
A | Mesozoic Era | I | Lower invertebrates |
B | Proterozoic Era | II | Fish & Amphibia |
C | Cenozoic Era | III | Birds & Reptiles |
D | Paleozoic Era | IV | Mammals |