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 Elli 's classification of injured teeth a class IV represents 
Select and explain. 
A. Non-vital tooth, B. Avulsed tooth, C. Fracture involving only the enamel, D. Fracture involving enamel and dentin but not pulp
A: Non-vital tooth
Answer: A: Non-vital tooth 
Explanation: None