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': 'Best method of localization of the placenta is : \nSelect and explain. \nA. Vaginal examination, B. Amniography, C. Uteroscopy, D. Ultrasonogram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ultrasonogram', 'role': 'assistant'}]