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
Double base smokeless gun powder contains: AIIMS 12 
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. Nitrocellulose and nitroglycerin