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: Anatomy
All are cardiac poisons except 
Select and explain. 
A. Opioids, B. Digitalis, C. Oleander, D. Odollum
A: Opioids
Answer: A: Opioids 
Explanation: Cardiac poisons Are digitalis, oleander, odollum, aconite, hydrocyanic acid, cleistanthus. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 399