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
Tooth in the mandibular arch which is most likely to be
displaced due to arch size discrepancy is 
Select and explain. 
A. First molar, B. Second molar, C. First premolar, D. Second premolar
D: Second premolar
Answer: D: Second premolar 
Explanation: Mandibular 2nd premolar is the most likely tooth to be displaced due to arch size discrepancy.