Which statement best describes assisted reproductive technology (ART)?

• A. All fertility treatments where sex cells are used in natural cycles.
• B. All fertility treatments where both eggs and sperm are manipulated, including IVF, ZIFT, and GIFT.
• C. Only IVF procedures.
• D. Treatments that do not involve manipulation of eggs or sperm.

Answer: (B)

Assisted reproductive technology involves fertility interventions that require handling or manipulating eggs and sperm to enable fertilization and embryo development, often outside the natural body process. This broad approach includes procedures where both eggs and sperm are manipulated, such as IVF, ZIFT, and GIFT.

In IVF, multiple eggs are retrieved from the ovaries, fertilized with sperm in the laboratory, and the resulting embryos are cultured before being placed into the uterus. ZIFT places a fertilized egg (a zygote) into the fallopian tube soon after fertilization, while GIFT transfers mixed eggs and sperm into the fallopian tube for fertilization to occur more proximally within the body. The unifying idea is active manipulation of gametes or embryos to achieve fertilization, not simply natural-cycle attempts.

The other statements don’t fit because ART is not limited to natural cycles without manipulation, nor is it restricted to just IVF; it encompasses multiple techniques that involve handling eggs or sperm and/or embryos.