This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-HIV Drugs, Subject name: Pharmacology
Testing of HLA-B' 5701 is recommended prior to initiation of this antiretroviral agent:- 
Select and explain. 
A. Atazanavir, B. Nelfinavir, C. Raltegravir, D. Abacavir
D: Abacavir
Answer: D: Abacavir 
Explanation: Testing of HLA-B' 5701 is recommended prior to initiation of abacavir. Abacavir if given in a patient who has HLA-B' 5701 causes high risk of MI.