How many of the following pairs of contraceptive methods and their categories are correctly matched? (I) Tubectomy : Surgical method (II) Lactational amenorrhea : Natural method (III) Vaults : Barrier method (IV) Lippes loop : Oral method

Step-by-step solution

(I) Tubectomy is a surgical method of contraception in females. (Correct) (II) Lactational amenorrhea is a natural method based on the absence of menstruation and ovulation due to intense lactation following parturition. (Correct) (III) Vaults are barrier methods made of rubber that are inserted into the female reproductive tract to cover the cervix. (Correct) (IV) Lippes loop is a non-medicated Intra Uterine Device (IUD), not an oral contraceptive method. (Incorrect) Therefore, exactly three pairs are correctly ma