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
According to WHO classiﬁcation of periapical pathology, sinus to oral cavity comes  under: 
Select and explain. 
A. 4.6, B. 4.6, C. 4.61, D. 4.62
D: 4.62
Answer: D: 4.62 
Explanation: None