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 contact area on the distal surface of a maxillary
first premolar should be placed in: 
Select and explain. 
A. Middle 3rd of proximal surface with lingual embrasure greater than the facial embrasure, B. Occlusal 3rd of proximal surface with the lingual embrasure greater than facial embrasure, C. Occlusal 3rd of proximal surface with facial embrasure greater than lingual embrasure, D. Middle 3rd with facial embrasure greater than the lingual embrasure
A: Middle 3rd of proximal surface with lingual embrasure greater than the facial embrasure
Answer: A: Middle 3rd of proximal surface with lingual embrasure greater than the facial embrasure 
Explanation: None