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 generations of amalgam exhibit highest nobility? \nSelect and explain. \nA. 3rd generation amalgam, B. 4th generation amalgam, C. 5th generation amalgam, D. 6th generation amalgam', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The set amalgam exhibits the highest nobility of any previous amalgam and has been the most recent 6th generation of amalgam to be developed.\nReference: Marzouk Operative dentistry, pg-106', 'role': 'assistant'}]