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': 'All the following are features of classic triad of ectopic pregnancy except \nSelect and explain. \nA. Amenorrhea, B. Pain, C. Bleeding, D. Mass per abdomen', 'role': 'user'}, {'content': "Answer: D \nExplanation: The classic triad of ectopic pregnancy is delayed menstruation, pain, and vaginal bleeding or spottingReference: William's Obstetrics; 25th edition; Chapter 19; Ectopic pregnancy", 'role': 'assistant'}]