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
Ring sideroblasts are characteristically seen in: 
Select and explain. 
A. Myelodysplastic syndrome (MDS), B. Acute Lymphoid Leukemia (ALL), C. Acute Myeloid Leukemia (AML), D. Anemia of chronic disease
A: Myelodysplastic syndrome (MDS)
Answer: A: Myelodysplastic syndrome (MDS) 
Explanation: Ring sideroblasts are characteristically seen in MDS. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Pages 624-25; Manual of Practical Medicine By R Alagappan, 3rd Edition, Pages 352-3