A 17-year-old boy presents 4 hours after ingesting 20 g of paracetamol in a deliberate overdose. He is well and has no vomiting. According to Australian paracetamol poisoning guidelines, what is the most appropriate next step?AReassure and discharge because he is asymptomaticBMeasure serum paracetamol concentration at 4 hours post ingestion and use the nomogram to determine need for acetylcysteineCStart acetylcysteine immediately without measuring paracetamolDDelay measurement of paracetamol level until 24 hours post ingestionEGive activated charcoal only and no further treatmentCheck my answer