This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Nucleoside is made up of 
Select and explain. 
A. Pyrimidine, B. Histone, C. Sugar, D. Purine
A: Pyrimidine
Answer: A: Pyrimidine 
Explanation: Nucleosides are glycosylamines that can be thought of as nucleotides without a phosphate group. A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a 5-carbon sugar (either ribose or deoxyribose)