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
in case of unstable lie of fetus, the placenta is usually: 
Select and explain. 
A. Cornual, B. Lateral wall, C. Fundus, D. Lower segment
D: Lower segment
Answer: D: Lower segment 
Explanation: Unstable lie This is a condition where the presentation of the fetus is constantly changed beyond 36th week of pregnancy when it should have been stabiliseed The causes are those which prevent the presenting pa to remain fixed in the lower pole of the uterus that is grand multipara,hhydramnios,contracted pelvis,placenta prae,pelvic tumor At admission the investigation is directed to exclude placenta prae,contracted pelvis,or congenital malformation of the fetus with the help of sonography for the localisation of placenta D.C.DUTTA&;S TEXTBOOK OF OBSTETRICS,Pg no:397,7th edition