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
IOC to detect abnormally located placenta; 
Select and explain. 
A. TVS, B. TAS, C. Doppler, D. MRI
A: TVS
Answer: A: TVS 
Explanation: 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)