This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries by Firearms, Subject name: Forensic Medicine
All are components of black gun powder except: 
Select and explain. 
A. Charcoal, B. Lead peroxide, C. Potassium nitrate, D. Sulphur
B: Lead peroxide
Answer: B: Lead peroxide 
Explanation: Ans: b (Lead peroxide) Ref: Reddy, 27th ed,p. 187Components of black gun powder - Potassium nitrite 75%Sulphur 10%Charcoal 15%Smokeless gun powderNitrocelluloseNitroglycerineNitroguanidineSemismokeless powder80% Black gun powder + 20% smokeless powder- Lead peroxide is present in printing mixture.