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
Fixation period of intrusive luxation injury is? 
Select and explain. 
A. 2 weeks, B. 4 weeks, C. 4 weeks, if semi-rigid & 2 weeks, if rigid, D. 6-8 weeks
B: 4 weeks
Answer: B: 4 weeks 
Explanation: None