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: Pathology
[{'content': 'The polypeptide chains of hemoglobin A are composed of \nSelect and explain. \nA. 1 alpha, 3 beta, B. 2 alpha, C. 2 alpha, 2 beta, D. 1 alpha, 2 beta, 1 delta', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hemoglobin A has 2 alpha and 2 beta chains.\nHbA2 has two alpha and two delta chains.', 'role': 'assistant'}]