This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abortion, Subject name: Gynaecology & Obstetrics
[{'content': 'A 25 yr. old comes in emergency with 2 1/2 months amenorrhea and abdominal pain and bleeding from vagina for 1 day. Her vitals are stable. On per speculum examination, mild bleeding is seen coming from the os. On per vaginal examination, the uterus is 10-week size, os is open and admits one finger. The most likely diagnosis is? \nSelect and explain. \nA. Threatened abortion, B. Missed abortion, C. Inevitable abortion, D. Incomplete abortion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Inevitable abortionThe size of the uterus corresponds to the period of gestation, bleeding is mild, os is open, thus inevitable abortion.', 'role': 'assistant'}]