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
Arch length analysis of a dentition shows a discrepancy of more than 10 mm. This indicates: 
Select and explain. 
A. No extraction required if treated at an early age, B. No extraction required, C. Extraction of posterior teeth, D. Proximal stripping
C: Extraction of posterior teeth
Answer: C: Extraction of posterior teeth 
Explanation: None