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
A 36 years old multigravida at 34 weeks, with previous 2 normal vaginal delivery now presented with unstable lie. The most likely diagnosis it s case is: 
Select and explain. 
A. Oligohydramnios, B. Placenta pre, C. Pelvic tumor, D. Uterine anomalies
B: Placenta pre
Answer: B: Placenta pre 
Explanation: Ans. b. Placenta pre