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
Factor responsible for resorbability of primary dentition is/are: 
Select and explain. 
A. Resorption is genetically determined., B. Primary teeth have successors which apply pressure., C. Both of the above., D. None
C: Both of the above.
Answer: C: Both of the above. 
Explanation: None