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
Which is the most common cytogenetic abnormality in adult Myelodysplastic syndrome (MDS) ? 
Select and explain. 
A. Trisomy 8, B. 20q, C. 5q, D. Monosomy 7
A: Trisomy 8
Answer: A: Trisomy 8 
Explanation: None