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
Nucleoside reverse transcriptase inhibitors are : a) Zalcitabine b) Delavirdine c) Nevirapine d) Stavudine e) Ritonavir 
Select and explain. 
A. cd, B. ad, C. bc, D. be
B: ad
Answer: B: ad 
Explanation: None