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
For alveolar distraction adequate height of mandible needed is? 
Select and explain. 
A. 4-6 mm, B. 6-8 mm, C. 8-10 mm, D. 10-12 mm
C: 8-10 mm
Answer: C: 8-10 mm 
Explanation: None