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
Activated charcoal can be used in all poisoning except 
Select and explain. 
A. Barbiturates, B. Opioids, C. Alcohol, D. Cyanides
D: Cyanides
Answer: D: Cyanides 
Explanation: Activated charcoalcharcoal Uses: in poisoning like Barbiturates Opiates Strychnine Digitalis Salicylic acid Phenol Benzodiazepines Nicotine Phenothiazines Anti- epileptics Alcohol It is not useful in poisoning with corrosives, heavy metals, cyanide, hydrocarbons. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 401