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
Earlier closure of a suture is called 
Select and explain. 
A. Synchondrosis, B. Ankylosis, C. Synostosis, D. Epiphysis
C: Synostosis
Answer: C: Synostosis 
Explanation: None