A 22-year-old man presents 4 hours after ingesting an unknown quantity of acetaminophen in a suicide attempt. He is asymptomatic and vital signs are stable. According to toxicology guidelines, what is the most appropriate next step?AReassure because he is asymptomaticBMeasure serum acetaminophen concentration at 4 hours post-ingestion and use the nomogram to guide N-acetylcysteine therapyCStart N-acetylcysteine only if liver enzymes are elevatedDWait 24 hours before deciding on any treatmentEInduce emesis with ipecacCheck my answer