Tubectomy is a method of sterilization in which
A. Ovaries are removed surgically
B. Small part of vas deferens is removed or tied up
C. Uterus is removed surgically
D. Small part of fallopian tube is removed or tied up

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Hint: Tubal ligation, tubal sterilization or Tubectomy is the method which permanently prevents pregnancy and hence any type of birth control is not needed after this procedure. But, this procedure does not protect against sexually transmitted diseases. It is a reversible procedure.

Complete answer:
Tubal ligation is commonly called as Tubectomy. It is a surgical procedure of female sterilization. In this procedure, the fallopian tubes are blocked, tied up or removed permanently. Tubal ligation prevents the fertilization of eggs by the sperm and therefore hinders the implantation of a fertilized egg. Tubal ligation is essentially a permanent method of sterilization and birth control for women.

Tubectomy done by blocking or removing fallopian tubes can be done through an open abdominal or laparoscopic surgery. This procedure can be performed either instantly after the end of a pregnancy, called a "postpartum tubal ligation", or it can also be done more than six weeks after the end of a pregnancy, called an "interval tubal ligation".

Female sterilization done through the method of tubal ligation is mainly used to permanently avoid a spontaneous pregnancy in the future. However, both hysterectomy and bilateral oophorectomy are similar surgeries but they generally have more health risks than the tubal ligation procedure.

Hence, the correct answer is option (D)

Note: Vasectomy is a surgical method for male sterilization or permanent contraception in men. During this procedure, the male vasa deferentia are cut and tied up or sealed to prevent sperm from entering the urethra and thus prevent the fertilization of an egg during sexual intercourse.