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
Central incisor tooth arrangement in tapering arch is 
Select and explain. 
A. Rotation of incisors on their long axis inward at the distal aspect, B. Rotation of incisors on their long axis inward at the facial aspect, C. Rotation of incisors on their long axis inward at the mesial aspect, D. Central incisors almost in a straight line
A: Rotation of incisors on their long axis inward at the distal aspect
Answer: A: Rotation of incisors on their long axis inward at the distal aspect 
Explanation: None