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
Most commonly missing tooth is 
Select and explain. 
A. Upper 3rd molar, B. Lower 3rd molar, C. Upper lateral incisor, D. Lower 2nd premolar
B: Lower 3rd molar
Answer: B: Lower 3rd molar 
Explanation: None