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': "The major antigenic determinant of H.influenzae is? \nSelect and explain. \nA. 'IVY protein, B. Capsular polysaccharide, C. Catalase, D. Coagulase", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Capsular polysaccharide", 'role': 'assistant'}]