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: Medicine
[{'content': 'Hemoglobin Poland is best defined as \nSelect and explain. \nA. Alpha 2 : Delta 2, B. Alpha 2 : Epsilon 2, C. Zeta 2 : Gamma 2, D. Zeta 2 : Epsilon 2', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. Zeta 2 : Gamma 2Hb Gower I - Zeta 2 / epsilon 2Hb Poland - Zeta 2 / gamma 2Hb Gower II - Alpha 2 / epsilon 2', 'role': 'assistant'}]