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': 'In diagnosing the carious lesions, the tooth surface is examined visually. Which of the following is not considered as visual examination? \nSelect and explain. \nA. Cavitations, B. Brownish black discoloration of pits and fissures, C. Opacification, D. Softness of the tooth surface', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The caries can be detected by\xa0\n\nVisual methods (Cavitation, Chalky appearance of teeth)\nTectile methods (Checking carefully by using an explorer)', 'role': 'assistant'}]