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
The average root surface area (mm2) of the maxillary 2nd
premolar is 
Select and explain. 
A. 234, B. 220, C. 273, D. 204
B: 220
Answer: B: 220 
Explanation: None