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: Surgery
The most frequent tooth to be impacted is : 
Select and explain. 
A. Lower third molar, B. Lower canine, C. Upper third molar, D. Upper premolar
A: Lower third molar
Answer: A: Lower third molar 
Explanation: Impacted tooth :

Is the tooth that has failed to erupt completely or partially to its correct position in the dental arch and its eruption potential has been lost.

Order of frequency :

Mandibular 3rd molar (i.e. Lower 3rd molar).
Maxillary 3rd molar (Upper 3rd molar).
Maxillary canine.