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
[{'content': 'On the basis of X height of b/w lower edge of mental foramen & inferior border of mandible original alveolar ridge height will be? \nSelect and explain. \nA. 2X, B. 3X, C. 4X, D. 5X', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]