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': 'A 28 years old female with a history of 8 wks amenorrhoea complains of vaginal bleeding and lower abdominal pain. On USG examination there is gestational sac with absent fetal pas. The diagnosis is : \nSelect and explain. \nA. Ectopic pregnancy, B. Incarcerated aboion, C. Threatened aboion, D. Corpus luteum cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. Incarcerated aboion', 'role': 'assistant'}]