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: Unknown
[{'content': 'Uterine bleeding at 12 weeks gestation without any cervical dilationis an indicative of \nSelect and explain. \nA. Incomplete abortion, B. Threatened abortion, C. Missed abortion, D. Inevitable abortion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bleeding occurs in about 30 to 40%of human gestations before 20 weeks of pregnancy, with about half of these pregnancies ending in spontaneous abortion.\nA threatened abortion takes place when this uterine bleeding occurs without any cervical dilation or effacement', 'role': 'assistant'}]