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': 'Main advantage of chisel edge finish line is: \nSelect and explain. \nA. Conservation of tooth structure, B. Provides adequate bulk of metal, C. Provides easy visualization on impression, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]