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 ALL patient; at which stage can the orthodontic treatment be done: 
Select and explain. 
A. During chemotherapy, B. Before chemotherapy, C. 2 years after remission, D. Any time as not affected by ALL
A: During chemotherapy
Answer: A: During chemotherapy 
Explanation: None