Final answer:
The nurse should identify the patient's statement about taking ranitidine on an empty stomach as understanding of the teaching.
Step-by-step explanation:
The nurse should identify the following patient statement as understanding of the teaching:
- "I need to take ranitidine on an empty stomach to get the maximum benefit."
By taking ranitidine on an empty stomach, the medication can be better absorbed and provide the desired effect. This statement shows that the patient understands the importance of proper administration of the medication. Other statements may not demonstrate the same level of understanding.