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: Dental
[{'content': 'Which of the following impact strength test measures the strength through both preswing and postswing? \nSelect and explain. \nA. Charpy, B. I rod, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: I Rod is newer and easier method to measure the impact strength through pre swing only.', 'role': 'assistant'}]