This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
All are cardiotoxic except 
Select and explain. 
A. Aconite, B. Opium, C. Oleander, D. Nicotine
B: Opium
Answer: B: Opium 
Explanation: Opium is somniferous poison, not cardiotoxic poison. cardiotoxic poisons: Car- Cardiac D- Digitalis O- Oleander N- Nicotine A- Aconite Mnemonic: CAR DONA