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
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 : 
Select and explain. 
A. Dilaceration, B. Fusion, C. Gemination, D. Concrescence
B: Fusion
Answer: B: Fusion 
Explanation: None