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
In measuring Vickers hardness no. which of the following is used: 
Select and explain. 
A. Spherical indenter, B. Steel ball indentation, C. Rhomboid shaped indenter, D. 136-degree diamond pyramid
D: 136-degree diamond pyramid
Answer: D: 136-degree diamond pyramid 
Explanation: None