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
6 month old baby with severe pallor and hepatospenomegaly. Similar history with the sibling. Investigation of choice – 
Select and explain. 
A. Bone marrow biopsy, B. Hb electrophoresis, C. Hb estimation, D. Platelet count
B: Hb electrophoresis
Answer: B: Hb electrophoresis 
Explanation: None