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
In which off the follwing age group myelodysplastic syndromes (MDS) are most common - 
Select and explain. 
A. 2-10., B. 15-20, C. 25-40, D. > 50 years
D: > 50 years
Answer: D: > 50 years 
Explanation: None