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: Forensic Medicine
All are adulterants of heroin, except 
Select and explain. 
A. Chalk powder, B. Quinine, C. Charcoal, D. Fructose
C: Charcoal
Answer: C: Charcoal 
Explanation: Adulterants of heroin are sucrose, dextrose, fructose, lactose, mannitol, starches, inositol, chalk powder, milk powder, talcum powder, flour, quinine, procaine, lidocaine, acetyl procaine, methaphyrilene and caffeine.