Pancytopenia with hypocellular bone marrow seen in:
a. Fanconi's anemia(Ref: Nelson's 20/e p 2362-2371, Chai 8/e p 345-347)Fanconi's anemia shows pancytopenia with hypocellular bone marrow while others in the options cause hypercellular bone marrow.
Fanconi's anemia
Paroxysmal nocturnal hemoglobinuria
Hairy cell leukemia
Myelopthisis
C.V.S.