This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 1, Subject name: Forensic Medicine
[{'content': 'Rotten egg odour is not characteristic with which substance \nSelect and explain. \nA. Disulfiram, B. Hydrogen sulphide, C. N - Acetyl cysteine, D. Nitrobenzene', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Rotten egg odour can be felt in - Disulfiram, Mercaptans, N acetyl cysteine, Hydrogen sulphide.', 'role': 'assistant'}]