<prompt> All of the following are causes of pancytopenia with cellular bone marrow except:Paroxysomal noctural hemoglobinuriaDyskeratosis congenitaMegaloblastic anemiaHairy cell leukemia  <response>: Answer is B Dyskeratosis congenita Dyskeratosis congenita is associated with Pancytopenia and a hypocellular marrow. 