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
Dental and periodontal infections can pose a severe risk to patients under 
Select and explain. 
A. Chemotherapy, B. Radiotherapy, C. Ozone therapy, D. Water therapy
B: Radiotherapy
Answer: B: Radiotherapy 
Explanation: None