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: Pharmacology
[{'content': 'Gemtuzumab acts against : \nSelect and explain. \nA. CD11a, B. CD22, C. CD33, D. CD45', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Gemtuzumab used in the treatment of AML, is a monoclonal antibody against CD33.', 'role': 'assistant'}]