This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Proved to be effective in the management of preeclampsia: 
Select and explain. 
A. Zinc, B. Calcium, C. Magnesium, D. None
B: Calcium
Answer: B: Calcium 
Explanation: Drugs used in Prophylaxis of Preeclampsia:

Low dose aspirin: Calcium: Role +/– Folic acid supplementation. Antioxidants–Vitamin C, Vitamin E, and Lycopene