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
Which of the following is a content of dentinal tubules 
Select and explain. 
A. Odontoblastic process, B. Afferent nerve terminal, C. Dendrites of Antigen presenting cells, D. All
D: All
Answer: D: All 
Explanation: Contents of Dentinal tubule

Odontoblastic process
Afferent Nerve terminal
Dendrites of antigen presenting cell
Dentinal fluid
intratubular dentin