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
[{'content': "Constitutional pancytopia can be seen in following except \nSelect and explain. \nA. Fanconi's anemia, B. Diamond - Blackfan syndrome, C. Dyskeratosis congenita, D. Schwachman Diomond syndrome", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diamonds blackfan syndrome is a pure red cell aplasia. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]