This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Forensic Medicine
[{'content': 'Nitroguanidine is used as a propellant cahrge in \nSelect and explain. \nA. Semismokeless gun powder, B. Single based smokeless gun powder, C. Double based smokeless gun powder, D. Triple based smokeless gun powder', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Triple base powder consists of nitrocellulose, nitroglycerin, and nitroguanidine. The quantity of nitroglycerin is small but sufficient to give power; the nitroguanidine lowers the flame temperature while adding an active explosive constituent. Ref - Krishan Vij textbook of forensic medicine and toxicology 5e pg - 239', 'role': 'assistant'}]