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': 'Aboion is the expulsion or extraction from the uterus, spontaneous or induced, or the fetus or embryo weighing: \nSelect and explain. \nA. Less than 100 gm, B. Less than 50 gm, C. Less than 250 gm, D. Less than 500 gm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Less than 500 gm', 'role': 'assistant'}]