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': 'A diagnostic wax-up is indicated when _____. \nSelect and explain. \nA. Re-establishing anterior guidance, B. A provisional fixed prosthesis is to be fabricated, C. Uncertainty exists regarding esthetics, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is recommended that any time there is a question regarding the treatment outcome involving a prosthetic device, or the need to produce templates for provisional restorations that reproduce a desired form of teeth, a diagnostic wax-up should be generated.', 'role': 'assistant'}]