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: C i.e. Charcoal Eleven adulterants were identified with a frequency of occurrence that exceeded 5% Most commonly found compounds: Quinine), Mannitol, Lactose, ProcaineOther substances found included: Caffiene, Sucrose), Chalk(), Powder milk, Talcum powder, Starches etc.