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 of the following age group myelodysplastic syndrmome (MDS) are most common: 
Select and explain. 
A. 10-Feb, B. 15-20, C. 5q, D. >50
D: >50
Answer: D: >50 
Explanation: Answer is D (> 50 years) Idiopathic MDS is a disease of the elderly. The mean age of onset is 68 years. Myelodysplastic Syndromes (Disease of the elderly with mean onset > 68 years) Heterogenous group of haematological disorder Characterized by - Peripheral blood cytopenias - Trilineage dysplastic changes - Hypercellular bone marrow - Propensity to undergo transformation into Acute Myeloid LeukaemiaQ. The French American British Group has classified this disorder into 5 pathological entities - Refractory Anemia - Refractory Anemia with ring sideroblasts - Refractory Anemia with Excess blasts - Refractory Anemia with Excess blasts in transformation - Chronic Myelomonocytic Leukaemia