This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pediatrics
Constitutional pancytopia can be seen in following except 
Select and explain. 
A. Fanconi's anemia, B. Diamond - Blackfan syndrome, C. Dyskeratosis congenita, D. Schwachman Diomond syndrome
B: Diamond - Blackfan syndrome
Answer: B: Diamond - Blackfan syndrome 
Explanation: Diamonds blackfan syndrome is a pure red cell aplasia. Reference: GHAI Essential pediatrics, 8th edition