This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': '18-20wks Level II scan is done for? \nSelect and explain. \nA. Diagnosis of fetal anomaly, B. Lung maturity, C. Sex determination, D. AFI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]