This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: viral infection, Subject name: Medicine
A nursing staff while putting iv line to a severely ill patient of HIV accidentally got a needle stick injury. Which of the following investigations will be most appropriate for her? 
Select and explain. 
A. P24 antigen capture assay, B. ELISA test, C. Western blot, D. Blood culture
A: P24 antigen capture assay
Answer: A: P24 antigen capture assay 
Explanation: Ideally, - PCR HIV RNA should be done since not in option so, P24 antigen capture assay