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': 'A laboratory technician was accidentally exposed to a HIV serum positive sample, which of the following shall be the role of zidovudine in treatment of this patient ? \nSelect and explain. \nA. Protects against acquiring the HIV infection, B. Makes the patient seronegative, C. Delays the progression of disease, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]