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
Munsell system is used to: 
Select and explain. 
A. Deﬁne and measure colour qualitatively, B. Deﬁne and measure physical properties of gold alloys, C. Evaluate brittleness of diﬀerent alloys, D. Measure diﬀerent colours quantitatively
D: Measure diﬀerent colours quantitatively
Answer: D: Measure diﬀerent colours quantitatively 
Explanation: Munsell system is used to measure diﬀerent colours quantitatively.