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: Pathology
[{'content': 'Which of the following procedures is used as a routine technique for karyotyping using light microscopy? \nSelect and explain. \nA. C- banding, B. G- banding, C. Q- banding, D. V- staining', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Giemsa stain is the most commonly used staining method that allow identification of each individual chromosome, on the basis of a distinctive and reliable pattern of alternate light and dark bands along the length of the chromosome. Since giemsa stain is used, the procedure is called G banding. Ref: Robbins Pathologic Basis of Disease, 6th Edition, Pages 165-6', 'role': 'assistant'}]