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
Crown infraction is also known as: 
Select and explain. 
A. Uncomplicated crown fracture., B. Green stick fracture., C. Complicated crown fracture, D. All of the above.
B: Green stick fracture.
Answer: B: Green stick fracture. 
Explanation: None