Final answer:
The correct nurse's response is that tics associated with Tourette's disorder often fluctuate in frequency and severity, and this does not mean they're not real. It's common for symptoms to vary, and this should not be mistaken for the child faking them.
Step-by-step explanation:
The concern that a child diagnosed with Tourette's disorder may be "faking" their tics because they appear intermittently is a common misunderstanding. The correct response from the nurse would be: "Tics often change frequency or severity. That doesn't mean they aren't real." This accurately reflects the nature of Tourette syndrome, which is a neurological disorder characterized by involuntary vocal sounds and movements. The presence of tics can indeed fluctuate, and this variability is a typical aspect of the condition, not necessarily an indication of their authenticity or a reaction to medication.