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
Angle formed between mandibular plane and the long axis of mandibular central incisor is: 
Select and explain. 
A. 90° ± 5°, B. 25°, C. 120°, D. 80°± 2°
A: 90° ± 5°
Answer: A: 90° ± 5° 
Explanation: None