This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "Constitutional pancytopenia can be seen in following except- \nSelect and explain. \nA. Fanconi's anemia, B. Diamond-Blackfan syndrome, C. Dyskeratosis congenita, D. Schwachman Diamond syndrome", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Diamond-Blackfan syndrome", 'role': 'assistant'}]