The correct answer is A. A placenta.
Explanation
The placenta is an exclusive organ of females, this organ develops during pregnancy, which occurs only in females, and connects the gestating mother and the fetus through the umbilical cord. Indeed, the placenta makes possible for the fetus to receive nutrients, expel waste the place, breathe, and regulate the temperature. Additionally, once the gestation is finished, this organ is no longer necessary because it has already fulfilled its function, so it is expelled during delivery. So, the correct answer is A. A placenta.
