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
Complement components are: 
Select and explain. 
A. Lipids, B. Proteins, C. Lipoproteins, D. Polysaccharide
B: Proteins
Answer: B: Proteins 
Explanation: Ans. b. Proteins