This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ballistics, Subject name: Forensic Medicine
[{'content': 'Which of the following is not seen in fired caridge case \nSelect and explain. \nA. Rifling markings, B. Firing pin marking, C. Extractor markings, D. Ejector markings', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fired caridge case shows Firing pin marking, Extractor markings & Ejector marking. Rifling markings are found only in fired bullet; not in the fired caridge case.', 'role': 'assistant'}]