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
Rounding of internal line angles: 
Select and explain. 
A. Increases the resistance form of the tooth to fracture., B. Increases the resistance to fracture of the restoration., C. Increases the strength of the restoration ., D. All of the above
A: Increases the resistance form of the tooth to fracture.
Answer: A: Increases the resistance form of the tooth to fracture. 
Explanation: None