This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Techniques in molecular biology, Subject name: Biochemistry
[{'content': 'For karyotyping, the dividing cells are arrested by the addition of colchicines in the following mitotic phase: \nSelect and explain. \nA. Telophase, B. Metaphase, C. Anaphase, D. Prophase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Colchicine is used during karyotyping to arrest the cell in metaphase In metaphase , all chromosomes lie at the equator', 'role': 'assistant'}]