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': 'Objective of calibrating examiner before survey is to: \nSelect and explain. \nA. Ensure uniform interpretation, understanding and application of diagnostic criteria, B. Measure consistently at different times and under a variety of conditions, C. Reduce intra- and inter examiner reliability, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]