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 is true about non-zinc alloys? \nSelect and explain. \nA. It is more plastic, B. It is more workable, C. It is less susceptible to oxidation, D. Useful in cases where its clinically impossible to eliminate moisture from the field of operation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Amalgam not containing zinc or any of its substitutes will tend to be less plastic and less workable and more susceptible to oxidation. Non-zinc alloys should be chosen only in cases where clinically impossible to eliminate moisture from the field of operation.\nReference: Marzouk Operative dentistry, pg-111', 'role': 'assistant'}]