This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which action by a nursing assistant (NA) when caring for a patient who is pancytopenic indicates a need for the nurse to intervene? 
Select and explain. 
A. The NA assists the patient to use dental floss after eating., B. The NA makes an oral rinse using 1 teaspoon of salt in a liter of water., C. The NA adds baking soda to the patient’s saline oral rinses., D. The NA puts fluoride toothpaste on the patient’s toothbrush.
A: The NA assists the patient to use dental floss after eating.
Answer: A: The NA assists the patient to use dental floss after eating. 
Explanation: Use of dental floss is avoided in patients with pancytopenia because of the risk of infection and bleeding. The other actions are appropriate for oral care of a pancytopenic patient.