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
Strength of gypsum can be measured with: 
Select and explain. 
A. Vicat needle, B. Gillmore needle, C. Kreb's penetrometer, D. Universal testing machine
D: Universal testing machine
Answer: D: Universal testing machine 
Explanation: A typical universal testing machine can analyze materials in tension, compression, or shear.