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
Isolated deletion of which chromosome cause myelodysplastic syndrome 
Select and explain. 
A. 2q, B. 5q, C. 8q, D. llq
B: 5q
Answer: B: 5q 
Explanation: Ans. is 'b' i.e., 5q