This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'A 5-year-old girl came with history of progressively increasing pallor since bih and hepatosplenomegaly. Which is the most relevant test for achieving diagnosis? \nSelect and explain. \nA. Hb electrophoresis, B. Peripheral smear examination, C. Osmo c fragility test, D. Bone marrow examination', 'role': 'user'}, {'content': "Answer: A \nExplanation: Progressive increasing pallor along with hepatosplenomegaly in a five-year-old girl is consistent with a diagnosis of thalassemia. (Thalassemia intermedia) 'Hemoglobin electrophoresis' is the test of choice of diagnosing this condition and hence is the option of choice here.", 'role': 'assistant'}]