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: Microbiology
Certain viruses have been isolated in crystalline
form and have been found to be 
Select and explain. 
A. Nucleotides, B. Phospholipids, C. Scteroproteins, D. Nucleoproteins
D: Nucleoproteins
Answer: D: Nucleoproteins 
Explanation: None