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: Pathology
[{'content': 'Gemination of teeth occur due to \nSelect and explain. \nA. Division of a single tooth bud after calcification, B. Division of a single tooth bud before calcification, C. Fusion of two teeth before calcification, D. Fusion of two teeth after calcification', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]