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 factor for breech presentation is 
Select and explain. 
A. Maternal diabetes, B. Oligohydramnios, C. Anterior placental implantation, D. Preeclampsia
B: Oligohydramnios
Answer: B: Oligohydramnios 
Explanation: Risk factors for breech presentation

Oligohydramnios 
Fundal placental implantation 
Placenta previa 
Hydrocephaly
Twin gestation
Anencephaly
Prior breech delivery