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': 'Combination that can be used for restoring the missing teeth are: \nSelect and explain. \nA. Porcelain opposing porcelain, B. Acrylic opposing acrylic, C. Porcelain opposing teeth with gold veneering, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All given options are valid restorative options for restoring a missing tooth.', 'role': 'assistant'}]