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
According to the location, a pulp stone partly surrounding by pulp and fused to dentine is called as: 
Select and explain. 
A. Attached pulp stone., B. Embedded pulp stone., C. Free pulp stone., D. None.
A: Attached pulp stone.
Answer: A: Attached pulp stone. 
Explanation: None