this was a dumb question. the mneumonic "DIDanosine causes pancreaDIDis" is useful here
Going over other answers:
Abacavir is a NRTI so all of this inhibit nucleotide binding to RT and terminate the DNA chain. It doesnt end in the typical -vudine that we are used to for NRTI's but I guess we should keep it in mind because its contraindicated in patients with HLA B5701 mutation due to an increased risk in hypersensitivity. *Sketchy remember the Wizard aba cadabra guy with his spell book opened to HLAB5701 and associated skin rash on the wizards arm
Acyclovir is a guanosine analog that is monophosphorylated by thymidine kinase that inhibits viral DNA polymerase onces its incorporated into the replicating chain and terminates dNA. Its for HSV or VSV which doesn't fit in this question. Remember crystalline nephropathy and need for IV fluids with this one.
Didanosine is a NRTI as already mentioned that now we know causes pancreatitis.
Lamivudine is also a NRTI, Zidovudine also NRTI that causes anemia and can be used during pregnancy to decrease the risk of fetal transmission.
Ribavirin is an IMP inhibitor used in Hep C and inhibits purine synthesis. Side effects: causes hemolytic anemia and is a severe teratogen.
Bullshit memorization question. You have to know that the single NRTI that causes pancreatitis is didanosine.
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The Didanosine guy in the NRTI sketch is holding a pancreas sponge.