Which of the following is the least effective method of birth control?

1) Skin implants

2) Periodic abstinence

3) Pills

4) IUDs

Answer:2) Periodic abstinence

Explanation: Periodic abstinence is a natural contraceptive method wherein couples abstain from coitus at the time of ovulation, i.e. between the 10th to 17th day of the menstrual cycle in order to reduce chances of ovum meeting the sperms. It is least effective compared to chemical methods.

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