This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drug Abuse, Subject name: Forensic Medicine
[{'content': 'The fatal dose of this poison is:- \nSelect and explain. \nA. 10 mg, B. 100 gram, C. 1 gram, D. 10 grams', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The photo shows cocaine. The fatal dose is 1 gram.', 'role': 'assistant'}]