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': 'Isolated deletion of which chromosome causes myelodysplastic syndrome - \nSelect and explain. \nA. 2q, B. 5q, C. 8q, D. 11q', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]