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
Flow of a material refers to: 
Select and explain. 
A. Continued change of the material under a given load, B. The consistency of a material when mixing, C. The homogeneity of gypsum products, D. Dimensional change of the material during settings
A: Continued change of the material under a given load
Answer: A: Continued change of the material under a given load 
Explanation: The term flow, rather than creep, has generally been used in dentistry to describe the rheology of amorphous materials.
Creep is defined as the time-dependent plastic strain of a material under a static load or constant stress.
The creep or flow is measured as the percentage decrease in length that occurs under these testing conditions.
Key Concept: Flow of a material refers to continued change of the material under a given load.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 33, 34