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: Unknown
Which of the following drugs is effective against HIV with Y181C mutation? 
Select and explain. 
A. Festinavir, B. Lersivirine, C. Elvitegravir, D. Dolutegravir
B: Lersivirine
Answer: B: Lersivirine 
Explanation: Lersivirine
Festinavir is a NRTI shown to be effective in adefovir and tenofovir resistance
Lersivirine is a NNRTI effective against HIV with Y181C mutation
Elvitegravir is a integrase inhibitor used for initial / naïve treatment
Dolutegravir is a integrase inhibitor approved for raltegravir-resistant infections