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: Physiology
[{'content': 'Plasma ceruloplasmin alpha 2 globulin is a \nSelect and explain. \nA. alpha 1 globulin, B. alpha 2 globulin, C. beta 1 globulin, D. beta 2 globulin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]