Fanconi's anemia is a –: (A) Constitutional anemia, (B) Hemolytic anemia, (C) Iron deficiency anemia, (D) Auto - immune anemia
Answer is A. Constitutional pancytopenia

Constitutional pancytopenia is defined as decreased marrow production of the 3 major hematopoietic lineages on an inherited basis, resulting in anemia, neutropenia and thrombocytopenia.
Important causes are : -
Fanconi anemia                             o Amegakaryocytic thrombocytopenia
Shwachman-Diamond syndrome      o Down syndrome
Dyskeratosis congenita                   o Noonan syndrome