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
Before eruption the position of permanent mandibular incisor buds relative to primary incisors is: 
Select and explain. 
A. Superior and facial, B. Inferior and facial, C. Superior and lingual, D. Inferior and lingual
D: Inferior and lingual
Answer: D: Inferior and lingual 
Explanation: None