This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breech Presentations , Subject name: Gynaecology & Obstetrics
The commonest cause of breech presentation is: 
Select and explain. 
A. Prematurity, B. Hydrocephalus, C. Placenta praevia, D. Polyhydramnios
A: Prematurity
Answer: A: Prematurity 
Explanation: Ans. is 'a' i.e.,, Prematurity RepeatAt 30 weeks of pregnancy, approximately 25% of women have breech presentation. The fetus undergoes spontaneous version usually between 30th and 34th week. This corrects the breech position. Any maternal or fetal condition, which prevents this spontaneous version will result in a persistent breech presentation.