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
A youthful feminine smile have all the characteristics except? 
Select and explain. 
A. Golden proportion is followed, B. Closure of incisor embrasure, C. Rounding of incisal line angles, D. Softened facial line angles
B: Closure of incisor embrasure
Answer: B: Closure of incisor embrasure 
Explanation: None