This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
A multlgravlda with previous 2 normal deliveries presents with unstable Lie of the fetus at 34 weeks Gestation. What could be the most probable cause? 
Select and explain. 
A. Placenta pre, B. Oligohydramnios, C. Uterine anomaly, D. Pelvic tunKtur
A: Placenta pre
Answer: A: Placenta pre 
Explanation: Placenta prae Defined as a placenta located paly or completely in the lower uterine segment.The bleeding is called inevitable or unavoidable haemorrhage as dilatation of internal os inevitably results in haemorrhage (refer pgno:128 Sheila textbooks of obstetrics 2 nd edition)