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: 
Select and explain. 
A. PNH, B. G6PD deficiency, C. Acquired aplastic anemia, D. Thalassemia
A: PNH
Answer: A: PNH 
Explanation: Answer is A (PNH) Amongst the options provided PNH is the single best answer of choice.