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
'S' shape of dentinal tubule is due to: 
Select and explain. 
A. Incremental deposition, B. Peritubular dentin, C. Crowding of odontoblasts, D. Due to excess amount of organic component
C: Crowding of odontoblasts
Answer: C: Crowding of odontoblasts 
Explanation: None