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
What percentage of cases of mandibular incisors have single apical foramen 
Select and explain. 
A. 97.80%, B. 82.50%, C. 60%, D. 60%- 78%
A: 97.80%
Answer: A: 97.80% 
Explanation: None