Answer:
Taking antibiotics only on doctor prescription and completing the full course of antibiotics.
Explanation:
Antibiotic resistance occurs when bacteria do not get harmed or killed by a drug which is made against them. Misuse and overuse of antibiotics are the main culprits which induce antibiotic resistance in bacteria.
To prevent the spreading of antibiotic-resistant bacteria antibiotics should only be taken on doctor's prescription. Full course of antibiotics should be done to eliminate all the bacteria which ensures that no bacteria is left to gain antibiotic resistance against the drug.
Antibiotics do not affect or kill virus therefore they should not be taken in viral infection.
Your answer here is Commensalism by process of elimination
