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
A deficiency of 5-8 mm usually requires extraction of: 
Select and explain. 
A. First molars, B. Second premolars, C. First premolars, D. Second molars
C: First premolars
Answer: C: First premolars 
Explanation: None