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: Biochemistry
[{'content': 'Banding is: \nSelect and explain. \nA. Method of detecting single gene deletion, B. Fluoroscene filters are used, C. Y-chromosome is seen in interphase, D. Trypsin and Giemsa are used', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Method of detecting single gene deletion', 'role': 'assistant'}]