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': 'Gold standard for all dental cements is referred to: \nSelect and explain. \nA. ZOE cement, B. ZnPO4 cement, C. Ca(OH)2 cement, D. Silicate cement', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Around 1879, zinc phosphate cement was introduced and although the formulation has been refined during more than a century of use, it is a luting agent that has consistently been successful in clinical practice and even today is still considered the “gold” standard.', 'role': 'assistant'}]