Gamete intra-fallopian transfer involves transferring eggs and sperm into the fallopian tube to fertilize.

• A. Transferring eggs and sperm into the fallopian tube to fertilize
• B. Transferring an embryo (zygote) into the fallopian tube
• C. Transferring a fertilized embryo into the uterus
• D. Transferring sperm directly into the fallopian tube

Answer: (A)

Gamete intra-fallopian transfer centers on fertilization happening inside the body by placing both gametes into the fallopian tube. Eggs retrieved from the ovaries and sperm are placed together in the fallopian tube so fertilization occurs in vivo, closely mirroring natural conception. This differs from transferring an embryo or zygote into the fallopian tube or uterus, which is a different assisted-reproduction approach that involves lab fertilization or a different transfer site. In IVF-related methods, the embryo is formed outside the body and then moved into the uterus, not into the fallopian tube. Likewise, transferring sperm alone into the fallopian tube describes a different technique.