This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'IOC to detect abnormally located placenta; \nSelect and explain. \nA. TVS, B. TAS, C. Doppler, D. MRI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Today transvaginal ultrasound is being used increasingly in diagnosing placenta.It is safe and gives much more accuracy than a transabdominal scan in placental localisation especially in posterior placentation and obese patients (refer pgno:130 sheila textbook of obstetrics 2 nd edition)', 'role': 'assistant'}]