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: Surgery
Period of immobilization indicated in a young adult patient with a fracture of the angle, receiving early treatment in which tooth is retained in fracture line: 
Select and explain. 
A. 3 weeks., B. 4 weeks., C. 5 weeks, D. 6 weeks.
B: 4 weeks.
Answer: B: 4 weeks. 
Explanation: Period of immobilization for fractures of tooth-bearing areas of mandible.

Young adult with fracture of the angle receiving early treatment in which tooth removed from fracture line= 3 weeks
If tooth retained in fracture line - 1 week is added. (3+1= 4 weeks)
If fracture occurs at the symphysis - 1 week is added. (4+1= 5 weeks)
If the patient age is 40 years and over - 1 or 2 weeks are added.
If fracture occurs in children and adolescents -Subtract 1 week.