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
Kim's classification type IV is 
Select and explain. 
A. Incomplete isthmus between two canals, B. Well defined complete isthmus between two canals, C. 3 or more canals with complete or incomplete isthmus, D. 3 or more canals without any visible connections
C: 3 or more canals with complete or incomplete isthmus
Answer: C: 3 or more canals with complete or incomplete isthmus 
Explanation: None