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
[{'content': 'At 34 weeks multigravida with previous 2 normal delivery has an unstable lie with the present pregnancy. It can be due to: \nSelect and explain. \nA. Oligohydramnios, B. Placenta pre, C. Pelvic tumor, D. Uterine anomalies', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Placenta pre can be associated with several other conditions, including malpresentation, unstable lie, preterm premature rupture of membranes, and intrauterine growth restriction. There may also be an increased risk of congenital anomalies; however, there is no association with any specific anomaly. Ref: Wagner S.A. (2013). Chapter 18. Third-Trimester Vaginal Bleeding. In A.H. DeCherney, L. Nathan, N. Laufer, A.S. Roman (Eds), CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 11e.', 'role': 'assistant'}]