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': 'A 4 year old child with one tooth less than the normal dentition shows a large tooth with two crowns and two root canals, the anomaly is : \nSelect and explain. \nA. Dilaceration, B. Fusion, C. Gemination, D. Concrescence', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]