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
Supernumerary teeth are formed due to abnormality in: 
Select and explain. 
A. Initiation., B. Proliferation., C. Morphodifferentiation., D. Histodifferentiation.
A: Initiation.
Answer: A: Initiation. 
Explanation: Abnormal initiation may result in the development of single or multiple supernumerary teeth.