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': 'Masseran kit is used for \nSelect and explain. \nA. Removal of fractured post, B. Restoration of periodontally compromised teeth, C. For cast crown fabrication, D. Vital bleaching', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]