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
Which of the following is dental formula of a 9 year
old child: 
Select and explain. 
A. 6EDC21/6EDC21, B. 6EDCBA/6EDC21, C. EDC21/EDC21, D. 76EDC21/76EDC21
A: 6EDC21/6EDC21
Answer: A: 6EDC21/6EDC21 
Explanation: None