This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Twin Pregnancy, Molar Pregnancy, Gestational Trophoblastic disease and contraception in special situations (Sour Grapes!), Subject name: Gynaecology & Obstetrics
Hypeension, proteinuria, and pitting edema are noted in the second month of the first pregnancy in a 25-year-old woman. The pathogenesis of her presenting complains is most closely associated with:- 
Select and explain. 
A. A benign tumor of the chorionic villi, B. Gestational diabetes mellitus, C. Primary endometrial cancer, D. A malignant trophoblastic tumor
A: A benign tumor of the chorionic villi
Answer: A: A benign tumor of the chorionic villi 
Explanation: Features of pre-eclampsia (hypeension, proteinuria, pitting edema) in the first trimester is most often secondary to a hydatidiform mole, which is a benign neoplasm of the chorionic villi. The uterus is frequently larger than the gestational age, Fetal Pas are not felt. Choricarcinomas are malignant trophoblastic tumors that most commonly develop from a preexisting complete mole,in 50% of cases although they can also be seen following a Normal pregnancy and aboion in 25% cases each