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
[{'content': 'Which pa of bacteria is most antigenic ? \nSelect and explain. \nA. Protein coat, B. Lipopolysaccharide, C. Nucleic acid, D. Lipids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]