Conception is best described as which event?

• A. Mating with sperm and ovary
• B. Birth of offspring
• C. Implantation of embryo
• D. Fertilization

Answer: (A)

Conception begins with the encounter of the male and female gametes during mating, when sperm are introduced to the female reproductive tract and have the chance to meet the ovum. That initiating event starts the sequence that leads to fertilization, embryo development, and eventual birth. The other options describe later stages: birth is the outcome after gestation, implantation happens after fertilization as the embryo attaches to the uterus, and fertilization is the actual fusion of the sperm and egg, which is part of conception but occurs after the initial mating event. So the option describing mating with sperm and ovum best captures the moment that starts conception.