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: Unknown
Mutarotation refers to change in: 
Select and explain. 
A. pH, B. Optical rotation, C. Conductance, D. Chemical properties
B: Optical rotation
Answer: B: Optical rotation 
Explanation: Mutorotation refers to the change in the specific optical rotation representing the interconversion of α- and β- anomers of D-glucose to an equilibrium.