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 pa of bacteria is most antigenic ? 
Select and explain. 
A. Protein coat, B. Lipopolysaccharide, C. Nucleic acid, D. Lipids
A: Protein coat
Answer: A: Protein coat 
Explanation: Ans. is d i.e., Lipids Proteins are most immunogenic, while lipids & nucleic acids are least immunogenic. Polysaccharides (carbohydrates) are less immunogenic than protein antigens, but are more antigenic than lipids & nucleic acids.