This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aplastic Anemia, Subject name: Pathology
Diagnostic criteria of pure red cell aplasia (PRCA) includes all of the following, except: 
Select and explain. 
A. Severe anemia, B. Reticulocyte count < 1%, C. Normocellular marrow, D. Thrombocytopenia
D: Thrombocytopenia
Answer: D: Thrombocytopenia 
Explanation: Pure red cell aplasia: Selective depletion of erythroid precursors in bone marrow with consequent severe normocytic normochromic anemia & reticulocytopenia. Diagnostic criteria for pure red cell aplasia are: Giant normoblasts in bone marrow Severe anemia Reticulocyte count < 1% Normocellular marrow with mature erythroblasts <0.5%.