Passage Summary: Bacteria always get stronger against medicine unless the medicine kills every single one of them. Right now, there isn't a single antibiotic that can kill all of 'Species X.'

Reasoning: The passage states that bacteria will always develop resistance to an antibiotic unless they are completely wiped out, and then notes that no single current antibiotic can completely wipe out Species X.

Analysis: We are given a conditional rule: if a species is not eliminated completely, it will inevitably develop resistance. We are then told that no *single* antibiotic currently available can eliminate Species X. By combining these, we can conclude that if any single current antibiotic is used against Species X, that species will eventually develop resistance to it. Be careful not to overstep; the stimulus doesn't rule out the possibility that a *combination* of antibiotics could eliminate the species, so the inference must stay focused on the limitations of single antibiotics.