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
[{'content': "Use of wadding in a smooth bore gun rifle 'produces all except - \nSelect and explain. \nA. Causes fatal injuries, B. Helps in lubrication, C. Optimum pressure, D. Sealing the air", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Functions of wad are:-\n\n(i) It separates the projectiles from propellant.\n(ii) It seals the bore effectively.\n(iii) It prevents expanding gas from escaping, and\n(iv) It allows optimum pressure to develop.\n\nThe felt wad is impregnated with grease and this lubricates the bore.', 'role': 'assistant'}]