This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
Fatal dose of KCN is - 
Select and explain. 
A. 50-60 mg, B. 120-130 mg, C. 180-190 mg, D. 280-300 mg
D: 280-300 mg
Answer: D: 280-300 mg 
Explanation: poison fatal dose Cyanide (salt) : 200 to 300 mg Carbolic acid (Phenol) : 20 ml Castor : 5 to 10 seeds Copper sulfate : 30 gm Cocaine : 1 to 2 gm Heroin : 50 mg Opium : 500 mg Morphine : 200 mg Phosphorus : 60 to 120 mg