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
Resorbability of the roots of primary dentition is explained by 
Select and explain. 
A. Genetically determined, B. Pressure applied by successors, C. Both 1 and 2, D. None
C: Both 1 and 2
Answer: C: Both 1 and 2 
Explanation: Resorbability of the roots depends on both the above factors.
If there is no successor of primary tooth then it function as a permanent tooth and its root does nor resorb which indicates that its dependency on pressure applied by successor. It also depends on the genetic factors.