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': 'Chromosomal studies are done in which stage: \nSelect and explain. \nA. Prophase, B. Metaphase, C. Telophase, D. Anaphase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metaphase', 'role': 'assistant'}]