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: Surgery
True open bite is caused by 
Select and explain. 
A. Horizontal fracture of the maxilla, B. Unilateral fracture of mandibular angle, C. Fracture of the coronoid process of left side of mandible, D. Fracture of mandibular symphysis
A: Horizontal fracture of the maxilla
Answer: A: Horizontal fracture of the maxilla 
Explanation: None