A 27-year-old woman presents to the emergency department after ingesting an unknown quantity of acetaminophen 3 hours ago in a suicide attempt. She is alert and haemodynamically stable. What is the most appropriate next step in management?ADischarge her because she is asymptomaticBWait until she develops right upper quadrant pain before testingCMeasure serum acetaminophen level at 4 hours post-ingestion and start N-acetylcysteine if level is above treatment lineDStart haemodialysis immediatelyEGive activated charcoal only and no further treatmentCheck my answer