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 restorative materials requires more skills in manipulative maneuvers than others \nSelect and explain. \nA. Amalgam, B. Cast gold alloy, C. Pure gold, D. Composite', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]