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
[{'content': 'which of the following is also called as milk sugar \nSelect and explain. \nA. mannose, B. glucose, C. galactose, D. lactose', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lactose is the milk sugar; a disaccharide made of galactose and glucose.\nReference: Vasudevan 7th\xa0 ed, pg 77', 'role': 'assistant'}]