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 defined as "expulsion of fetus" less than....................gms : \nSelect and explain. \nA. 500, B. 800, C. 900, D. 1000', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 500', 'role': 'assistant'}]