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
Nucleoside is made up of: 
Select and explain. 
A. Pyrimidine, B. Purine, C. Sugar, D. All
D: All
Answer: D: All 
Explanation: A, B, C i.e. Pyrimidine, Sugar, Purine