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': '6 month old baby with severe pallor and hepatospenomegaly. Similar history with the sibling. Investigation of choice – \nSelect and explain. \nA. Bone marrow biopsy, B. Hb electrophoresis, C. Hb estimation, D. Platelet count', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]