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': 'Hb A 2 concentration in thalassemia trait is ? \nSelect and explain. \nA. 1, B. 1-2.5, C. 2.5-3.5, D. > 3-5', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e.,> 3.5 Nestrof test o This test is being widely used in India and other developing countries in thalassemia screening programmes. o The cases which are positive, subjected to HbA2 estimation for confirmation of thalassemia trait.", 'role': 'assistant'}]