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': 'lecurrent aboion in 1st trimester, investigation of choice : \nSelect and explain. \nA. Karyotyping, B. SLE Ab, C. HIV, D. TORCH infection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a i.e. Karyotyping', 'role': 'assistant'}]