Final answer:
The nurse should advise parents to "Keep medications in their original containers" to prevent accidental poisoning in toddlers, ensuring medications are not confused and that instructions are followed.
Step-by-step explanation:
When teaching a group of parents about poisoning prevention, particularly for parents with toddlers, the nurse should emphasize the importance of safety measures to avoid accidental poisonings. The correct statement the nurse should make is: "Keep medications in their original containers." This advice ensures that medications are not mistaken for something else and that safety warnings and dosage instructions are followed. It's essential to store dangerous substances, including cleaning products, medications, and small objects, out of reach of children to reduce the risk of accidental poisoning.