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': 'Minor modifications done in the existing tooth contours to improve a smile is termed - \nSelect and explain. \nA. Cosmetic contouring, B. Smile contouring, C. Micro dentistry, D. Enamel reshaping', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]