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
Which proximal box should be given preference if the adjacent tooth proximal box are similar in size. 
Select and explain. 
A. Prepare posterior First, B. Prepare anterior First, C. Any one can be prepared First, D. Both should be prepared simultaneously
A: Prepare posterior First
Answer: A: Prepare posterior First 
Explanation: None