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
HIV strains resistant to which of the following drugs may show cross resistance to Abacavir? 
Select and explain. 
A. Lamivudine, B. Didanosine, C. Enfuviide, D. Raltegravir
A: Lamivudine
Answer: A: Lamivudine 
Explanation: Ans. is'a'i.e.LamivudinelRef: KDT p.. 8081Resistance to abacavir develops slowly, and it exhibits little cross resistance with other NIs. Strains of HIV having resistance to zidovudine and lamivudine show cross resistance with abacavir.