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
Which of the following is most potent antigen for stimulating both humoral and cell mediated immunity? 
Select and explain. 
A. Adjuvant, B. Proteins, C. Polysaccharides, D. Lipids
B: Proteins
Answer: B: Proteins 
Explanation: None