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
Green strength with reference to plaster means 
Select and explain. 
A. Dry strength, B. Compressive strength, C. Strength of dental stone due to green colour, D. The wet strength
D: The wet strength
Answer: D: The wet strength 
Explanation: Two strength properties of gypsum are reported:

Wet strength (also known as green strength),.
Dry strength.

The wet strength is the strength that is determined when water in excess of that required for hydration of the hemihydrate remains in the test specimen. When such excess water is removed by drying, the strength obtained is the dry strength. The dry strength may be two or more times as high as the wet strength. Consequently, the distinction between the two is of considerable importance.
Phillips Science of Dental Materials ed 12 pg 188