This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'All the following are conjugate vaccines Except \nSelect and explain. \nA. Haemophilus influenzae type b, B. Pneumococcal, C. Neisseria meningitidis, D. Hepatitis A', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Subunit Vaccines* Haemophilus--purified capsular polysaccharide conjugated to protein* Neisseria meningitidis--capsular polysaccharides, pediatric version is conjugated to protein* Pneumococcal--capsular polysaccharide (7 and 23 serotypes) (pediatric version is conjugated to protein) Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 83', 'role': 'assistant'}]