This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMT Q Bank, Subject name: Forensic Medicine
Black powder composition: 
Select and explain. 
A. 15 % potassium nitrate + 10 % sulphur + 10% charcoal, B. 15 % potassium nitrate + 8 % sulphur + 10% charcoal, C. 75 % potassium nitrate + 8% sulphur + 15% charcoal, D. 75 % potassium nitrate + 10% sulphur + 15% charcoal
D: 75 % potassium nitrate + 10% sulphur + 15% charcoal
Answer: D: 75 % potassium nitrate + 10% sulphur + 15% charcoal 
Explanation: There are two types of Powder 1. Black Powder - consists of 75% KNO3-, 10% Sulphur and 15% Charcol 2. Smokeless powder - It consists of nitroglycerine, nitrocellulose and nitroguanide 3. Semi smokeless gun powder - Black (80%) + Smokeless (20%) - It is designated as FG, FFG, FFFG, etc., depending on the size of the grains. The more number of F's as number of fineness increases.