This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and Investigations, Subject name: Forensic Medicine
Double base smokeless gun powder contains: 
Select and explain. 
A. Nitrocellulose and nitroguanidine, B. Potassium nitrate and sulphur, C. Potassium nitrate and charcoal, D. Nitrocellulose and nitroglycerin
D: Nitrocellulose and nitroglycerin
Answer: D: Nitrocellulose and nitroglycerin 
Explanation: Ans. (D). Nitrocellulose and nitroglycerin(Ref: Review of Forensic Medicine & toxicology; Gautum Biswas; 2nd edition; Pg-215)BLACK gunpowder: Potassium nitrate (75%), Charcoal (15%) & Sulfur (10%)SMOKELESS gun powder:Single base: NitrocelluloseDouble base: Nitrocellulose + NitroglycrineTriple base: Nitrocellulose + Nitroglycerine + NitroguanidineSEMISMOKELESS gunpowder: 80% black & 20% smokeless gunpowder.