Final answer:
The nurse should monitor for tinnitus, or ringing in the ears, as an adverse reaction in a patient administered a salicylate. This side effect is specifically associated with salicylates among the options listed.
Step-by-step explanation:
In patients who have been administered a salicylate, the nurse should monitor for several adverse reactions. One of the notable side effects is tinnitus, which is a ringing in the ears. While other reactions like hypoglycemia and allergic reactions are possible with various drugs and supplements, tinnitus is a specific concern associated with salicylates and other similar medications such as quinine. As compared to other analgesics like acetaminophen, salicylates commonly cause less gastric distress but are known to induce tinnitus. It's important to recognize this side effect as it can indicate the drug level is too high or that the patient is experiencing toxicity. Therefore, the correct answer to the question is C) Tinnitus (ringing in the ears).