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
Endodontic therapy should preferably be initiated within______ post trauma. 
Select and explain. 
A. 2-3weeks, B. 3-4weeks., C. 2 months, D. 4 months.
B: 3-4weeks.
Answer: B: 3-4weeks. 
Explanation: None