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': 'Conservative cavity for amalgam restoration is made using: \nSelect and explain. \nA. 33½ inverted cone bur, B. No. 245 non standardized bur, C. Pear shaped bur, D. Taper fissure bur', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]