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: Medicine
[{'content': 'Chromosome X is \nSelect and explain. \nA. Metacentric, B. Submetacentric, C. Acrocentric, D. Telocentric', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Submetacentric - X-chromosome\nAcrocentric - Y-chromosome', 'role': 'assistant'}]