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
The fatal dose of this poison is:- 
Select and explain. 
A. 10 mg, B. 100 gram, C. 1 gram, D. 10 grams
C: 1 gram
Answer: C: 1 gram 
Explanation: The photo shows cocaine. The fatal dose is 1 gram.