Q. A 3-year-old boy is brought by his parents to the pediatric clinic with complaints that he has been irritable and has had trouble sleeping for the past week. They mention that he has been scratching his perianal area frequently, especially at night. They are concerned because they noticed some tiny, white, thread-like worms in his stool this morning. No other family members have similar symptoms. His appetite has been normal, and there have been no changes in his bowel habits. On physical examination, the perianal region appears slightly erythematous, with evidence of excoriations. The rest of his systemic examination is unremarkable. Diagnostic perianal tape test reveals the presence of Enterobius vermicularis eggs. His vaccinations are up to date. What is the most appropriate treatment for this patient's condition?