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': 'Non invasive method for locating an expelled Cu-T: March 2013 \nSelect and explain. \nA. Hysteroscopy, B. Laparoscopy, C. USG, D. Laparotomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. USG', 'role': 'assistant'}]