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 Down syndrome patient, which teeth have severe periodontitis 
Select and explain. 
A. Lower Anterior, B. Upper Anterior, C. Upper Molar, D. Lower Molar
A: Lower Anterior
Answer: A: Lower Anterior 
Explanation: None