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': 'Bevel in class II amalgam filling is given for: \nSelect and explain. \nA. Increased retention, B. Increased resistance, C. To prevent microleakage, D. Aesthetic reasons', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]