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
In a dried skull, holes on the lingual aspects of the deciduous teeth are called 
Select and explain. 
A. Volkmann canals, B. Canals of Hirschfeld and zuckerland, C. Haversian canals, D. Gubernacular canals
D: Gubernacular canals
Answer: D: Gubernacular canals 
Explanation: None