This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
All are adulterants of Heroin, except - 
Select and explain. 
A. Chalk powder, B. Quinine, C. Charcoal, D. Fructose
C: Charcoal
Answer: C: Charcoal 
Explanation: Important adulterants in heroin are starch (fructose & sucrose), caffeine, quinine, Paracetamol, scopolamine (Hyoscine), Noscapine, Lidocaine, Procaine, Phenobarbitone, Theophylline, Strychnine, Chalk, Flour, Talcum powder, Powdered milk, Phenacetin.