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 treating a tooth with a nonvital pulp and a sinus, the
sinus should be treated as follows: 
Select and explain. 
A. No special treatment, B. Cauterisation, C. Curettage of sinus, D. Use of cautery to eliminate the sinus
A: No special treatment
Answer: A: No special treatment 
Explanation: None