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': 'Surveyor is used for \nSelect and explain. \nA. Surveying diagnostic cast, B. Contouring wax patterns, C. Measuring undercuts, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The surveyor may be used for surveying the diagnostic cast, recontouring abutment teeth on the\xa0diagnostic cast, contouring wax patterns, measuring a speciﬁc depth of undercut, surveying ceramic\xa0veneer crowns, placing intracoronal retainers, placing internal rests, machining cast restorations, and\xa0 surveying and blocking out the master cast.', 'role': 'assistant'}]