Final answer:
Hydatidiform mole, also known as molar pregnancy, is a condition characterized by abnormal growth of the trophoblast, which is marked by the proliferation of trophoblastic cells without the development of a fetus. Symptoms include abnormal vaginal bleeding, a uterus that is larger than expected, and high levels of hCG hormone.
Step-by-step explanation:
Hydatidiform mole, also known as molar pregnancy, is a condition characterized by abnormal growth of the trophoblast, which is the outer layer of cells of the developing embryo. It is marked by the proliferation of trophoblastic cells without the development of a fetus. Therefore, option (b) Normal fetal development is incorrect. In molar pregnancy, trophoblastic hyperplasia occurs, leading to the formation of a mass of abnormal tissue in the uterus. This mass can cause symptoms such as abnormal vaginal bleeding, a uterus that is larger than expected, and high levels of hCG (human chorionic gonadotropin) hormone. So, option (a) Trophoblastic hyperplasia is correct, and option (c) Decreased hCG levels is incorrect. Additionally, molar pregnancy is associated with abnormal placental growth, so option (d) Healthy placental growth is incorrect.