This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasia, Subject name: Pathology
Which neoplasm causes pure red cell aplasia? 
Select and explain. 
A. Thymus, B. Breast, C. Hepatocellular, D. Bronchogenic
A: Thymus
Answer: A: Thymus 
Explanation: Ans. is 'a' i.e., Thymus* Pure red cell aplasia (PRCA) is an uncommon disorder in which maturation arrest occurs in the formation of erythrocytes. Erythroblasts are virtually absent in bone marrow; however, white blood cell and platelet production are normalCauses of PRCA include:* Idiopathic* Autoimmune disease such as SLE* Lymphoproliferative. Association of pure red cell aplasia with T-cell large granular lymphocyte leukemia is well recognized, especially in China* Thymoma* Viral infections such as HIV, herpes, parvovirus B19 (Fifth disease), or hepatitis* Drugs such as mycophenolic acid or erythropoietin* Congenital (Diamond-Blackfan anemia)