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: Biochemistry
which of the following is also called as milk sugar 
Select and explain. 
A. mannose, B. glucose, C. galactose, D. lactose
D: lactose
Answer: D: lactose 
Explanation: Lactose is the milk sugar; a disaccharide made of galactose and glucose.
Reference: Vasudevan 7th  ed, pg 77