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
Risk factors for preeclampsia:a) Chronic hypertenstionb) Obesityc) Placental ischaemiad) Multigravidae) Antiphospholipid syndrome 
Select and explain. 
A. acd, B. ace, C. cde, D. ade
B: ace
Answer: B: ace 
Explanation: None