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
Medical condition contraindicated for endodontic therapy: 
Select and explain. 
A. Rheumatic heart disease, B. Patients with pacemaker, C. Controlled diabetic, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: None