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': "'Squint' test is used as guide for selecting \nSelect and explain. \nA. Shade of teeth, B. Shape of teeth, C. Length of teeth, D. None of the above", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]