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
Pancytopenia with cellular marrow is seen in all Except: 
Select and explain. 
A. Megaloblastic anemia, B. Myelodysplasia, C. Paroxysmal nocturnal hemoglobinuria, D. G6 PD deficiency
D: G6 PD deficiency
Answer: D: G6 PD deficiency 
Explanation: Answer is D (G-6PD Deficiency) Glucose - 6 - PD Deficiency is not associated with Pancytopenia and a cellular marrow Myelodysplasias, PNH and Megaloblastic anemia (Vit B12,Folate deficiency) may present with Pancytopenia and a cellular marrow.