This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Fanconi's anemia is a: 
Select and explain. 
A. Constitutional anemia, B. Hemolytic anemia, C. Iron deficiency anemia, D. Auto-immune anemia
A: Constitutional anemia
Answer: A: Constitutional anemia 
Explanation: a. Constitutional anemia(Ref: Nelson's 20/e p 2390-2392, Ghai 8/e p 349-351)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 anemiaAmegakaryocytic thrombocytopeniaShwachman-Diamond syndromeDown syndromeDyskeratosis congenitaNoonan syndrome