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 investigation to diagnose ectopic pregnancy is : \nSelect and explain. \nA. Urine pregnancy test, B. Laparoscopy, C. USG, D. Hysteroscopy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Laparoscopy', 'role': 'assistant'}]