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
Accessory canals result from 
Select and explain. 
A. Defects in cementogenesis, B. Dividing epithelial bridges, C. Break in Hertwig's root sheath, D. Adherent epithelial rests
C: Break in Hertwig's root sheath
Answer: C: Break in Hertwig's root sheath 
Explanation: Accessory canals may occur either due to loss of root sheath cells or due to inclusion of blood vessels during root development.